According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 16 words with the pattern R--IF---. That is, eight letter words with 1st letter R and 4th letter I and 5th letter F. In alphabetical order, they are:

ramified

ramifies

ramiform

raniform

rarified

rarifies

ratified

ratifier

ratifies

reniform

resifted

retiform

rotifers

rotiform

rubified

rubifies

According to SOWPODS (the combination of Scrabble dictionaries used around the world) there are 4 words with the pattern --TI-ORM. That is, eight letter words with 3rd letter T and 4th letter I and 6th letter O and 7th letter R and 8th letter M. In alphabetical order, they are:

natiform

retiform

rotiform

setiform

Here are 8-letter words that end with R.

abattoir, abductor, abhorrer, abridger, abrupter, absenter, absolver, absorber, absurder, accentor, accepter, acceptor, accorder, accouter, achiever, acicular, acquirer, actioner, actuator, adductor, adjuster, adjustor, admitter, adroiter, adulator, advancer, affecter, affirmer, affrayer, aflutter, agitator, aglimmer, aglitter, airliner, alachlor, allosaur, allotter, alveolar, ambusher, ampullar, analyser, analyzer, ancestor, animater, animator, annealer, anointer, anovular, answerer, anteater, anterior, antiquer, antiwear, appealer, appeaser, appellor, appriser, apprizer, approver, argufier, armchair, armourer, arranger, arrester, arrestor, ascender, asperser, aspersor, assailer, assenter, assentor, asserter, assertor, assessor, assigner, assignor, assister, assistor, assorter, assuager, atomizer, attacher, attacker, attainer, attemper, attender, attester, attestor, atwitter, auguster, auntlier, austerer, avicular, avigator, avoucher, awakener, aweather, awfuller, bachelor, bacillar, backdoor, bagpiper, balancer, balisaur, balloter, baluster, bandager, banisher, banister, banterer, baptizer, barosaur, barrater, barrator, barrener, barretor, barterer, basifier, battener, batterer, baulkier, bayadeer, beachier, bebopper, beckoner, beclamor, bedchair, bedcover, bediaper, bedmaker, beechier, befinger, beflower, befouler, begetter, beginner, beguiler, behavior, beheader, beholder, belabour, believer, beliquor, bellower, bemurmur, bereaver, besetter, beshiver, besieger, bestower, betatter, betrayer, beveller, bewailer, bewilder, bewrayer, bickerer, bicolour, bicycler, bilander, bilinear, billeter, bimester, biometer, biovular, bisector, bitchier, bitterer, blancher, blastier, blazoner, bleacher, blearier, blencher, blighter, blockier, bloodier, bloomier, blottier, blousier, blowsier, blowzier, bluesier, blurrier, boilover, borderer, borrower, botchier, bottomer, bouncier, brabbler, braggier, brailler, brainier, brannier, brashier, brassier, brattier, brawlier, brawnier, breacher, breather, breezier, brickier, brighter, brittler, broacher, bronzier, broodier, broomier, brownier, bruncher, brushier, brusquer, bubblier, budgeter, buffeter, bunchier, burblier, burdener, burrower, busheler, buttoner, cadaster, calcspar, calendar, calender, calliper, callower, calypter, cameleer, canaller, canceler, candider, canephor, canister, cannular, canvaser, capabler, capmaker, caponier, capsomer, capsular, capturer, careener, careerer, caresser, carmaker, caroller, carouser, catbrier, catchier, catheter, catnaper, cavalier, caveator, caviller, cavorter, cellarer, cellular, cementer, censurer, chaffier, chalkier, chancier, chandler, chapiter, charrier, chasseur, chattier, chauffer, chaunter, cheekier, cheerier, cheesier, chelator, chertier, chestier, chicaner, chichier, chillier, chinkier, chirpier, chiseler, choosier, choppier, chortler, chromier, chubbier, chuckler, chuffier, chummier, chunkier, cingular, cinnabar, cipherer, circular, cislunar, clammier, clamorer, clangour, clankier, claqueur, classier, cleanser, clencher, cleverer, cliffier, clincher, clingier, cliquier, cloddier, cloggier, cloister, clothier, cloudier, clubbier, clumpier, clumsier, clunkier, coappear, coauthor, cochlear, cockspur, codebtor, codifier, codriver, coeditor, coenamor, cofactor, cognizer, coholder, coiffeur, colander, coleader, colessor, colinear, collator, colleger, colluder, colourer, columnar, combater, combiner, comelier, comether, commoner, communer, commuter, comparer, compiler, complier, composer, computer, conceder, conciser, condoler, condoner, conducer, condylar, confider, confiner, confuter, congener, conjurer, conjuror, conniver, consider, consoler, consular, consumer, convener, convenor, conveyer, conveyor, convoker, copastor, coplanar, corridor, cosigner, costlier, costumer, cottager, courtier, couthier, cowinner, coworker, cowriter, crabbier, craftier, craggier, crampier, crankier, crappier, crawlier, crayoner, creakier, creamier, creasier, creditor, creepier, cremator, crimpier, crippler, crispier, croakier, crossbar, croupier, crucifer, cruddier, crueller, crumbier, crummier, cruncher, crusader, crustier, cucumber, cuddlier, cudgeler, cultivar, cumberer, cupeller, curseder, cuspidor, customer, cutesier, cutwater, cyclecar, cylinder, cymbaler, cytaster, daintier, damneder, dampener, danglier, dapperer, darkener, darklier, darneder, daughter, deadener, deadlier, debarker, debonair, debunker, decanter, deceiver, decemvir, decenter, decipher, declarer, decliner, decolour, deemster, deepener, defeater, defector, defender, deferrer, deflator, deflower, defoamer, defogger, deforcer, deformer, defrayer, degasser, degender, degrader, dehorner, dejeuner, delouser, deluster, demander, demeanor, demerger, demister, dempster, demurrer, depicter, depictor, depleter, deplorer, deployer, deporter, depraver, depriver, deranger, deringer, desalter, descrier, deserter, deserver, designer, desilver, despiser, destrier, desulfur, detacher, detailer, detainer, detecter, detector, deterger, deterrer, detester, deticker, deviator, devourer, devouter, dialoger, dialyser, dialyzer, diameter, dictator, didapper, diemaker, diffuser, diffusor, digester, digestor, dimplier, dinosaur, diplexer, directer, director, disabler, disarmer, disaster, discolor, discover, disfavor, dishonor, disinter, disliker, dismaler, disorder, disposer, disputer, disrober, dissever, ditherer, diverter, divorcer, divulger, dodderer, doggoner, dognaper, domineer, doomster, dopester, doughier, douzeper, downpour, draffier, draftier, draggier, dragster, drawlier, dreamier, drearier, dreggier, drencher, dressier, dribbler, driftier, drippier, driveler, droolier, droopier, drossier, drowsier, druggier, drumlier, dulcimer, dumpster, duplexer, durneder, dweebier, earthier, eclipser, ecraseur, educator, effecter, effector, elevator, elicitor, eloigner, emanator, embalmer, embitter, emblazer, embodier, emborder, embosser, embracer, employer, emulator, enameler, enchaser, encipher, encloser, encumber, endanger, endeavor, endorser, endorsor, endpaper, enfetter, enfolder, enforcer, engender, engineer, engraver, enhancer, enjoiner, enlarger, enlister, ennobler, enricher, enroller, enslaver, ensnarer, entailer, epilator, epistler, equipper, eschewer, espalier, espouser, evildoer, evocator, examiner, exceeder, excluder, excreter, executer, executor, exemplar, exhorter, expander, expandor, expecter, expeller, expender, expiator, exploder, explorer, exporter, expunger, extender, extensor, exterior, extoller, extorter, extremer, extruder, eyeliner, eyewater, fairgoer, falconer, falterer, familiar, fastener, fathomer, fattener, faultier, favourer, featlier, feistier, feldsher, feldspar, fellator, ferreter, fetterer, fidgeter, figeater, filister, filmgoer, filterer, filthier, finagler, fingerer, finisher, fistular, flabbier, flaggier, flappier, flashier, flaunter, flavorer, fledgier, fleecier, fleshier, fletcher, flichter, flimsier, flincher, flintier, flirtier, floatier, flockier, flopover, floppier, flossier, flounder, flowerer, fluffier, flypaper, folksier, follower, fomenter, footgear, footwear, forebear, foregoer, foreseer, forester, forgiver, forrader, forsaker, forswear, fosterer, foveolar, freakier, frenular, frescoer, frettier, fribbler, frillier, fringier, friskier, frivoler, frizzier, frizzler, froggier, frondeur, frontier, frostier, frothier, frotteur, frouzier, frowsier, frowzier, fruitier, frumpier, furcular, furriner, furrower, fusileer, fusilier, gainlier, galloper, gamester, gammoner, gangliar, ganglier, gangster, ganister, gardener, garotter, garroter, gasalier, gaselier, gasifier, gasolier, gatherer, gazumper, gennaker, geologer, geometer, gesturer, ghostier, gigglier, gladlier, glairier, glassier, gleamier, gleetier, glimpser, glintier, glitzier, globbier, globular, gloomier, gloppier, glossier, glumpier, gnarlier, gnattier, gogglier, goldener, goodlier, gospeler, gossamer, gossiper, governor, grabbier, grabbler, grainier, grandeur, grandsir, granular, grappler, grassier, greasier, greedier, greenier, grimacer, grippier, grislier, grittier, grizzler, groggier, groovier, grottier, grounder, groutier, groveler, growlier, grubbier, grueller, gruffier, grumbler, grumpier, grungier, guiltier, gunpaper, hacklier, hagrider, hallower, hammerer, hamperer, hangover, hankerer, harasser, harborer, hardener, harkener, harrower, hastener, hatmaker, haulmier, havocker, haymaker, hazarder, headgear, heartier, heathier, hemipter, hexaplar, hijacker, hinderer, hizzoner, holdover, hollower, homelier, honester, honourer, hoopster, horrider, horsecar, hospodar, hosteler, hotelier, howitzer, huckster, hungrier, hydrator, icemaker, idolater, idolator, idoliser, idolizer, imaginer, imbalmer, imbitter, imitator, immenser, impacter, impactor, impairer, imparter, impeller, impellor, impinger, implorer, importer, imposter, impostor, improper, improver, impugner, inceptor, incliner, incloser, incumber, indenter, indentor, indicter, indictor, indorser, indorsor, inductor, indulger, infecter, infector, inferior, inferrer, infester, inflamer, inflater, inflator, infolder, informer, ingather, inhauler, inholder, injector, inlander, inputter, inquirer, inserter, insetter, insister, insnarer, inspirer, insulter, intender, intenser, interior, interwar, intruder, inventer, inventor, inverter, invertor, investor, involver, iodophor, islander, isolator, itemizer, jabberer, jaggeder, japanner, jauntier, jawboner, jetliner, jeweller, jigglier, jinglier, jokester, jongleur, jouncier, joyrider, junglier, junketer, keynoter, kibitzer, kidnaper, killdeer, kindlier, kinglier, kipperer, kludgier, klutzier, knitwear, knobbier, knottier, knubbier, knuckler, knurlier, komondor, kowtower, kreutzer, kvetcher, labeller, labourer, labrador, lamellar, lamenter, lamister, larcener, larkspur, larruper, lateener, latherer, laudator, laughter, launcher, lavalier, lavender, lavisher, lawgiver, lawmaker, leachier, lecturer, leftover, letterer, levanter, leveller, libeller, licencer, licenser, licensor, likelier, limberer, limpsier, lingerer, lingular, lioniser, lionizer, listener, litterer, livelier, loadstar, lodestar, loiterer, lonelier, longhair, longspur, longueur, loosener, lordlier, loudlier, lovelier, lowlifer, lowrider, lumberer, magister, maiasaur, maligner, malinger, maltster, mandator, maneuver, manpower, mapmaker, marauder, marblier, marketer, markhoor, marshier, massager, masseter, measlier, measurer, mediator, medullar, mellower, menswear, metaphor, micawber, micellar, microbar, midlifer, mightier, migrator, mijnheer, millibar, milliner, mimicker, minister, misalter, miscolor, misenter, misinfer, misinter, mislabor, mislayer, misliker, misnomer, misorder, misrefer, missteer, mistaker, mistutor, modeller, moderner, modester, modifier, molester, monicker, monsieur, moreover, mortiser, mosasaur, motioner, motleyer, motorcar, mouchoir, mouldier, mouthier, muenster, muleteer, multicar, murderer, murmurer, muscular, mutineer, mutterer, narrater, narrator, narrower, naysayer, nearlier, neckwear, neighbor, nettlier, neurular, newcomer, newwaver, nextdoor, nigglier, nightjar, nitrator, nonactor, noncolor, nonjuror, nonmajor, nonowner, nonpolar, nonskier, nonsolar, nonsugar, nonvoter, notifier, nubblier, nucellar, numberer, nummular, nurturer, objector, obscener, obscurer, observer, obsessor, obtainer, obtruder, obviator, occulter, occupier, odometer, offender, ohmmeter, oilpaper, oleander, oleaster, oligomer, onlooker, operator, oppugner, oracular, orangier, ordainer, orienter, ornerier, orometer, ossifier, ostiolar, outcaper, outhomer, outhumor, outliner, outliver, outrider, outsavor, outsider, outsteer, outswear, outtower, overbear, overdear, overdoer, overdyer, overfear, overhear, overnear, overseer, overstir, overwear, oxidiser, oxidizer, oximeter, oxpecker, oysterer, ozonizer, pacifier, packager, paintier, palpator, palterer, paltrier, pamperer, panderer, papillar, parachor, paramour, parcener, pardoner, parleyer, parroter, partaker, passover, pasturer, patchier, patellar, patentor, pattamar, patterer, peachier, pearlier, pebblier, peculiar, pedalfer, pedalier, pedaller, peignoir, penciler, pendular, pepperer, peptizer, perfumer, peripter, perjurer, pervader, pesterer, petiolar, petnaper, pewterer, phosphor, phreaker, piacular, picketer, pilaster, pilferer, pillager, pilsener, pimplier, pinaster, pinnular, pinscher, piscator, pitchier, placater, plaister, plankter, planular, plashier, playgoer, playwear, pleather, pledgeor, plighter, plottier, plougher, pluckier, plummier, plumular, plunkier, plushier, poachier, pocketer, poetiser, poetizer, pointier, poisoner, polestar, polisher, pollster, polluter, pomander, ponderer, portlier, posturer, potterer, pouchier, powderer, prattler, preacher, prealter, preciser, preclear, predator, prefacer, preluder, premolar, preorder, preparer, preppier, presager, presider, presumer, prettier, previsor, prickier, prisoner, prissier, privater, procurer, producer, profaner, profiler, profiter, prolabor, promiser, promisor, promoter, prompter, pronator, properer, proposer, provider, provoker, puckerer, puddlier, pullover, pulmotor, pulsator, pulvinar, punchier, punisher, purifier, purveyor, pushover, pustular, putterer, quackier, quaestor, quaggier, quainter, qualmier, quarrier, quartier, quaverer, queasier, queazier, quencher, quibbler, quippier, quipster, quirkier, quiverer, rabbiter, radiator, raggeder, rainwear, rampager, ransomer, rarefier, ratifier, ratooner, rattener, raveller, ravisher, realiser, realizer, reappear, reasoner, rebutter, recaller, recamier, recanter, receiver, recensor, recenter, receptor, reckoner, recliner, recoiler, reconfer, recorder, recycler, redactor, redeemer, redliner, redrawer, reductor, reechier, referrer, refilter, reflower, reformer, refunder, regainer, regather, register, rehabber, rehammer, reheater, reindeer, reissuer, rejecter, rejector, rejigger, rejoicer, relapser, releaser, reletter, reliever, reloader, remarker, remaster, remember, reminder, remitter, remittor, renderer, renumber, repairer, repealer, repeater, repeller, repenter, replacer, reporter, reprover, repulser, requirer, requiter, reroller, reseller, reserver, resetter, reshaper, reshower, resigner, resilver, resister, resistor, resolder, resolver, resorter, restorer, retailer, retailor, retainer, retarder, retemper, retorter, retracer, returner, reuniter, revamper, revealer, reveller, revenger, revenuer, reverser, reverter, reviewer, revolter, revolver, rewarder, rewinder, rewriter, rheumier, ricercar, rimester, ripplier, roadster, robuster, rocketer, rollover, romancer, roseolar, rottener, roturier, rubblier, rubeolar, rufflier, ruggeder, rummager, rumplier, saboteur, saccular, sallower, salvager, sandburr, sandspur, savorier, savourer, scabbier, scamster, scantier, scapular, scareder, scarrier, scattier, schiller, schizier, schooner, schusser, scimetar, scimitar, scimiter, sclaffer, scorcher, scourger, scouther, scrapper, scrawler, screamer, screener, screwier, scrimper, scripter, scrubber, scuffler, sculptor, scummier, scurfier, scurvier, scutcher, scuzzier, seafarer, seafloor, seamster, searcher, seasoner, seawater, secateur, seconder, secreter, secretor, seemlier, seigneur, seignior, selector, semester, sequitur, servicer, servitor, shabbier, shackler, shadower, shaggier, sheather, sheenier, shellier, shelvier, shielder, shiftier, shingler, shirtier, shiverer, shnorrer, shoalier, shoddier, shoulder, shoveler, shredder, shrewder, shrieker, shriller, shrimper, shrinker, shuffler, shuttler, sickener, sicklier, siffleur, signaler, silencer, silenter, silverer, simperer, sincerer, singular, sinister, sirupier, skankier, sketcher, skiddier, skijorer, skimpier, skinnier, skunkier, skydiver, slaggier, slalomer, slangier, slaverer, sleazier, sleekier, sleepier, sleetier, sleigher, slighter, slimsier, slinkier, slipover, slippier, slittier, sliverer, sloppier, sloshier, sloucher, sludgier, slummier, slushier, smarmier, smearier, smellier, smirkier, smoggier, smoocher, smoother, smoulder, smudgier, smuggler, smuttier, snaggier, snappier, snarlier, snatcher, snazzier, sneakier, sneerier, sneezier, sniffier, sniffler, sniggler, snippier, snitcher, sniveler, snobbier, snoopier, snootier, snoozier, snottier, snoutier, snubbier, snuffier, snuffler, softener, solander, solderer, solemner, songster, sorcerer, sorrower, souvenir, sparkier, sparkler, sparrier, spatular, specular, speedier, spendier, spherier, spicular, spiffier, spindler, spinster, splasher, splatter, splendor, splinter, splitter, splurger, splutter, spongier, spookier, spoonier, sportier, sporular, spottier, sprawler, spreader, sprigger, springer, sprinter, spritzer, sprucier, spunkier, spurrier, squaller, squander, squasher, squatter, squawker, squeaker, squealer, squeezer, squinter, squirmer, squirter, staggier, stalkier, stancher, starrier, startler, steadier, steamier, steelier, stemmier, stickier, stickler, stillier, stingier, stinkier, stippler, stipular, stitcher, stockcar, stockier, stodgier, stolider, stopover, stormier, strainer, straiter, strander, stranger, strapper, strawier, streaker, streamer, streeker, stressor, stricter, stringer, stripier, stripper, stroller, stronger, stropper, strummer, strutter, stubbier, stuccoer, stuffier, stumbler, stumpier, stupider, sturdier, styliser, stylizer, subahdar, subfloor, sublimer, sublunar, suborder, suborner, subpolar, subsider, subsolar, subtiler, subvicar, succorer, sufferer, sufficer, sugarier, sullener, sultrier, summoner, sunderer, superber, supercar, superior, supplier, supposer, supremer, surfacer, surmiser, surnamer, surveyor, surviver, survivor, swampier, swankier, sweatier, sweepier, swimmier, swimwear, swindler, swingier, swirlier, swishier, switcher, swizzler, swoonier, swoopier, syrupier, tabourer, tailleur, takeover, tamperer, tanglier, tarpaper, tattooer, tautomer, taverner, tawdrier, taxpayer, teamaker, teamster, teaseler, teenager, teensier, temperer, tenderer, testator, tetchier, tetramer, thatcher, therefor, thirster, thornier, thrasher, threader, threaper, thresher, thriller, throbber, thrummer, thruster, thrustor, thurifer, thwacker, thwarter, timelier, tinglier, tinkerer, tinklier, tissular, titrator, titterer, toastier, together, tonsilar, toothier, topsider, torchier, toreador, torrider, torturer, totterer, touchier, towerier, townwear, traditor, traducer, trampier, trampler, transfer, trapdoor, trashier, traveler, treadler, trembler, trencher, trendier, tressier, tressour, trickier, tricolor, trimeter, trimotor, triumvir, troubler, trouncer, troutier, trouveur, troweler, truckler, trundler, trustier, tunneler, turbocar, turnover, twaddler, twangier, twangler, tweakier, tweedier, twiddler, twiggier, twinkler, twirlier, twistier, twitcher, typifier, udometer, uglifier, ulterior, umbellar, unanchor, unbitter, underfur, uneasier, unevener, unfairer, unfetter, unfolder, unhairer, unholier, unicolor, unifilar, unipolar, unitizer, unkinder, unkosher, unlimber, unloader, unmasker, unpacker, unpucker, unreeler, unrepair, unrulier, unsicker, unsolder, untether, untidier, unwarier, unwinder, upbearer, upgather, upheaver, upholder, uplander, uplifter, upraiser, uprooter, upsetter, upstager, upstater, uptowner, urinator, utilidor, utiliser, utilizer, vacuolar, valuator, valvular, vanisher, vapourer, varactor, variolar, varistor, vascular, vaultier, vavasour, vavassor, veneerer, venturer, verderer, verderor, verditer, verifier, vexillar, vibrator, vilifier, villager, vintager, violater, violator, vitiator, vivifier, volleyer, voussoir, voyageur, vulgarer, wabblier, wafflier, wagglier, waggoner, walkover, walloper, wallower, wamblier, wanderer, wantoner, warmaker, warpower, warrener, warstler, waterier, watthour, wayfarer, waylayer, weakener, weaklier, weensier, weighter, welcomer, welldoer, whackier, whatever, wheatear, wheedler, wheezier, whelkier, whenever, wherever, whiffler, whinnier, whippier, whirlier, whistler, whitener, whittler, whizzier, whomever, whosever, wickeder, wieldier, wifelier, wigglier, wigmaker, willower, wingover, winnower, winsomer, winterer, wintrier, wirehair, wiselier, witchier, witherer, wobblier, wofuller, wonderer, woodener, woodsier, woollier, workhour, wormgear, worthier, wrangler, wrathier, wreather, wrencher, wrestler, wriggler, wristier, yammerer, yawmeter, yeasayer, yeastier, yellower, yodeller, zamindar, zemindar, zoolater

verb decisive