You can make more than a thousand words out of the letters in Happy Valentine's Day. The longest one is synadelphite (a mineral).
Here are some others:
happy
day
valentine
tine
pine
dine
vine
nine
tap
yap
leviathan
steadily
adhesive
inhalant
elapsed
tipsy
planet
planets
There are 1260 scrabble words of length 2 letters or longer:
2-letter words
aa, ad, ae, ai, al, an, as, at, ay, da, de, el, en, es, et, id, in, is, it, la, li, na, ne, si, ta, ti, ya, ye
3-letter words
aal, aas, ads, aid, ail, ain, ais, ait, ala, ale, als, alt, ana, and, ane, ani, ant, any, ate, ava, ave, aye, ays, dal, dan, day, dee, dei, del, den, des, dev, dey, die, din, dit, dye, eat, eds, eel, eld, els, end, ens, eta, eve, eye, ids, inn, ins, its, ivy, lad, las, lat, lav, lay, lea, led, lee, lei, let, lev, ley, lid, lie, lin, lis, lit, lye, nae, nay, nee, net, nil, nit, sad, sae, sal, sat, say, sea, see, sei, sel, sen, set, sin, sit, sly, sty, syn, tad, tae, tan, tas, tav, tea, ted, tee, tel, ten, tie, til, tin, tis, tye, van, vas, vat, vee, vet, via, vid, vie, vin, vis, yea, yen, yes, yet, yin
4-letter words
aals, adit, aide, aids, ails, ains, aits, alae, alan, alas, alee, ales, alit, alts, anal, anas, ands, anes, anil, anis, anna, ansa, anta, ante, anti, ants, asea, ates, aves, avid, ayes, ayin, dais, dale, dals, dans, data, date, davy, days, deal, dean, dees, deet, deil, dele, deli, dels, delt, dene, deni, dens, dent, deny, deva, devs, deys, dial, diel, dies, diet, dine, dins, dint, dita, dite, dits, diva, dive, dyes, dyne, ease, east, easy, eats, eave, edit, eels, eely, eide, elan, elds, else, ends, envy, esne, etas, etna, even, eves, evil, eyas, eyed, eyen, eyes, eyne, idea, ides, idle, idly, idyl, ilea, inly, inns, isle, lade, lads, lady, laid, lain, land, lane, lase, last, late, lati, lats, lava, lave, lavs, lays, lead, lean, leas, lees, leet, leis, lend, lens, lent, lest, lets, leva, levy, leys, lids, lied, lien, lies, line, linn, lins, lint, liny, list, lits, live, lyes, lyse, nail, nala, nana, nave, navy, nays, neat, need, nene, nest, nets, neve, nevi, nide, nils, nine, nits, sade, sadi, said, sail, sain, sale, salt, sand, sane, sate, sati, save, seal, seat, seed, seel, seen, send, sene, sent, seta, sial, side, sild, silt, sine, site, slat, slay, sled, slid, slit, sned, snit, snye, stay, stey, stye, syli, syne, tads, tael, tail, tain, tala, tale, tali, tans, tavs, teal, teas, teds, teed, teel, teen, tees, tela, tele, tels, tend, tens, tide, tidy, tied, ties, tile, tils, tine, tins, tiny, tivy, tyee, tyes, tyin, tyne, vail, vain, vale, vane, vans, vasa, vase, vast, vats, veal, vees, veil, vein, vela, veld, vena, vend, vent, vest, vets, vial, vide, vids, vied, vies, vile, vina, vine, vins, viny, visa, vise, vita, yald, yean, yeas, yeld, yens, yeti, yins
5-letter words
adits, adyta, aedes, aides, ailed, aisle, aland, alane, alans, alant, alate, alias, alien, aline, alist, alive, aliya, anele, anent, anile, anils, anise, anlas, annal, annas, ansae, antae, antas, anted, antes, antis, antsy, anvil, aside, asyla, atlas, avail, avast, avens, avian, ayins, daily, daisy, dales, dates, daven, davit, deals, dealt, deans, deave, deets, deils, deist, deity, delay, deles, delis, delta, delts, delve, denes, dense, dents, devas, devel, devil, dials, diene, diets, dines, dints, ditas, dites, ditsy, divan, divas, dives, dynel, dynes, eased, easel, eaten, eaved, eaves, edile, edits, elain, eland, elans, elate, elide, elint, elite, elves, enate, entia, etnas, evade, evens, event, evils, evite, ideal, ideas, idles, idyls, inane, inlay, inlet, inned, inset, isled, islet, istle, laden, lades, laity, lanai, lands, lanes, lased, lated, laten, lavas, laved, laves, layed, layin, leads, leady, leans, leant, lease, least, leave, leavy, leets, lends, lenes, lenis, lense, levin, levis, liana, liane, liens, lieve, lindy, lined, linen, lines, liney, linns, lints, linty, litas, lived, liven, lives, lyase, lysed, lysin, naevi, naiad, nails, naive, nalas, naled, nanas, nasal, nasty, natal, nates, naval, navel, naves, neats, needs, needy, neist, nenes, neves, nidal, nides, nieve, nines, nival, nyala, sadly, saint, salad, salty, salve, sandy, saned, satay, sated, satin, saved, savin, sayed, sayid, sedan, seedy, seely, seine, selva, senna, senti, setae, setal, seven, sidle, sieve, silty, silva, sited, slain, slant, slate, slaty, slave, sleet, slide, snail, snide, stade, staid, stain, stale, stand, stane, stave, stead, steal, steed, steel, stein, stela, stele, stied, stile, styed, style, styli, sylva, taels, tails, tains, talas, tales, tansy, teals, tease, teels, teens, teeny, teind, telae, teles, telia, tends, tenia, tense, tesla, tidal, tides, tilde, tiled, tiles, tinea, tined, tines, tinny, tsade, tsadi, tyees, tyned, tynes, vails, vales, valet, valid, valse, vanda, vaned, vanes, vasal, vasty, veals, vealy, veena, veils, veins, veiny, velds, veldt, venae, venal, vends, venin, vents, vesta, vials, viand, vinal, vinas, vined, vines, vinyl, vised, vista, vitae, vital, yeans, yeast, yenta, yente, yetis, yield
6-letter words
adenyl, adnate, advent, advise, aedile, aedine, aisled, alands, alanin, alants, alated, alates, alevin, aliens, alined, alines, aliyas, alvine, aneled, aneles, anenst, annals, anneal, ansate, anteed, anvils, aslant, avails, avians, aviate, avidly, dainty, dalasi, dative, davens, davies, davits, daylit, deasil, deaves, delate, delays, delist, deltas, delves, denial, denies, dental, dentil, dentin, desalt, detail, detain, devein, devels, devest, devils, devise, dienes, diesel, dilate, distal, divans, divest, dynast, dynels, easily, ediles, elains, elands, elated, elates, eldest, elides, elints, elites, enates, endite, endive, enisle, enlist, ennead, ensile, entail, envied, envies, evades, evenly, events, evited, evites, eyelid, ideals, ideate, idlest, inanes, indene, indent, inland, inlays, inlets, innate, insane, instal, intend, invade, invent, invest, island, ladens, ladies, lanais, lanate, lasted, lateen, latens, latina, layins, leaden, leaned, leased, leaved, leaven, leaves, lenite, lenity, lensed, lenten, levant, levied, levies, levins, levity, lianas, lianes, linden, linens, lineny, linnet, linsey, linted, listed, listen, litany, livens, livest, lysate, lysine, naiads, nailed, naives, naleds, nasial, native, navaid, navels, navies, neaten, neatly, nested, nestle, nidate, nieves, ninety, nyalas, sailed, sained, salina, saline, saliva, salted, saltie, salved, salvia, sandal, sanely, sanity, sateen, satiny, savant, savate, savine, sealed, seated, sedate, sedile, seidel, seined, seitan, senate, sendal, senile, sennet, sennit, sienna, sieved, silane, silent, silted, silvae, silvan, sinned, slanty, slated, slatey, slaved, slavey, slayed, sleave, sleety, slieve, snivel, stadia, staled, staned, staved, stayed, steady, steely, stelae, stelai, styled, svelte, sylvae, sylvan, sylvin, syndet, taenia, tailed, tanned, teased, teasel, teensy, teinds, tenail, teniae, tenias, tennis, tensed, tildes, tineal, tineas, tinned, tinsel, tisane, vailed, vainly, valets, valine, valise, vandal, vandas, vanity, vanned, vastly, vealed, veenas, veiled, veinal, veined, velate, veldts, venial, venine, venins, vented, vestal, vested, vialed, viands, vilest, vinals, vineal, vinyls, visaed, viseed, vitals, yeaned, yeelin, yenned, yentas, yentes, yields
7-letter words
adenine, adenyls, advents, advisee, aediles, alanine, alanins, alevins, aliened, anality, analyse, analyst, analyte, andante, aniseed, annates, anneals, annelid, ansated, anviled, availed, aviated, aviates, datival, datives, dealate, delaine, delates, denials, densely, density, dentals, dentils, dentine, dentins, destain, destine, destiny, details, detains, deveins, deviant, deviate, devisal, dialyse, dilates, dyneins, elastin, elative, elysian, endites, endives, enisled, enliven, enneads, ensiled, enslave, entails, entasia, estival, etesian, evident, evilest, eyelids, ideates, inanely, inanest, indenes, indents, inlands, instead, intends, intense, invades, invents, isleted, lanated, lateens, latened, latinas, leadens, leanest, leavens, lenient, lenited, lenites, levants, lievest, lindane, lindens, lineate, linnets, linseed, lisente, livened, naiades, nailset, naively, naivest, naivete, naivety, nastily, natives, navaids, naysaid, neatens, needily, nestled, nidates, sainted, saintly, salient, saltine, sealant, seedily, setline, seventy, slainte, slanted, sleaved, snailed, snidely, staidly, stained, standee, stanine, syenite, sylvine, sylvite, taeniae, taenias, tenails, tensely, tensile, tensive, vainest, valeted, valiant, valines, vandals, vedalia, veinlet, velites, venines, ventail, vilayet, vistaed, yeasted, yeelins
8-letter words
adenines, aestival, alanines, alienate, analysed, analytes, andantes, andesite, andesyte, annalist, annealed, annelids, asyndeta, aventail, dateline, datively, dealates, delaines, dentalia, dentinal, dentines, desinent, deviants, deviates, divalent, elatives, enlisted, enlivens, enslaved, entailed, innately, insanely, invented, invested, leadiest, leaviest, levanted, lindanes, lineated, listened, naivetes, nasality, natively, salivate, sanative, sedately, sedative, sentinel, sniveled, steadily, tinseled, valiants, validate, vaseline, vealiest, vedalias, veinlets, venality, venetian, ventails, vilayets
9-letter words
alienated, alienates, aventails, datelines, dialysate, evidently, intensely, salivated, sylvanite, valentine, validates, vandalise, venetians
10-letter words
desalinate, valentines
nest-and-date-late-eat-diet-lady-teens-eyes-save
insanely salivated invented sedative listened nasality evidently enslaved alienate dateline steadily validates enlisted deviants annealed dentinal adenines andantes
3
Words from "happy" include these:haphappyhaypayyah (slang for yes)yap
Words that can be made with the letters in 'happy' are:aahhahaypapayya yap
Valentines - book - has 224 pages.
Words that can be made for the letters in Happy Holidays are:aadahahahahoyaidailAlpoalsoasashashydailydaisdaisydashdaydialdipdippydishdodoilyhahadhailhalohashashhayhihidHildaHilohiphippohippyhishohodholdholyhopHopiII'didIdaidolisladladylaidlaplashlaylidloloadloployalohoiloilyoldpapadpaidpailpalpappaypayolaphylapipipplaidplayplodplopployplypodpoipopposhsadsaidsaladsapsappysayshadshadyshipshoalshopshySidsilosipslapslayslidslipslopsloppysosoapsoapysodsodasoilsoldsolidsopsoppysoyspaspayspoilspyyayapyayyipyoYoda
13
6
2
I don't know but my cousin got married on Valentines day.
It is estimated that over 100,000 cards are made for valentines day.
Words that can be made form the letters in 'happy spring' are:aahairairyanangryanyapingasashaspgaingapgarishgarnishgasgashgaspgaygingnashgraingrainygraphgraspgraygrayishgringriphahaghairhairyhangharpharpingharpyhashasphayhayinghihiphippyhisIinisnagnapnarynaynighnipnippypapainpairpanpangpansyparparishparsnippaypayingpaysphasingphrasingpipigpinpingpipprayprayingpraysprigprypryingragrainrainyranrangraprappingrashraspraspingraspyrayrigringringripsagsangsapsappingsappysarisaysayingshagshapingsharingsharpshinshinyshipshysighsignsinsingsipsirsnagsnapsnappysnipsnippyspaspansparsparingspayspayingspinspinysprainsprangspraysprayingsprigspringyspryspyspyingyappingyarn
7 words
Words that can be made from the letters in Happy Hanukkah are:aahahaanankhanyaukayahhahahhankhankyhaphayhuhhunkhunkyhuphyphakahunakappakayakkhankhaphknapnahnapnappynaynupapahpanpappapapapayapaypukkapunpunkpunkahpunypuppupapyauhunhappyupyakyankyapyaupyuanyukyup