Truant, elephant, pant, rant, recant, descant, supplant, plant, chant, slant, pedant.

To name but a few.

4-letter words

cant, hant, pant, rant, want

5-letter words

alant, brant, chant, giant, grant, leant, meant, plant, quant, riant, scant, slant

6-letter words

arrant, askant, aslant, bezant, byzant, decant, dopant, eluant, errant, extant, gelant, incant, infant, jurant, levant, mutant, natant, nutant, octant, pedant, pliant, recant, savant, secant, sejant, sonant, tenant, truant, tyrant, vacant, volant

7-letter words

abeyant, adamant, affiant, bezzant, blatant, brisant, buoyant, callant, clamant, coolant, courant, currant, defiant, descant, deviant, discant, distant, dormant, elegant, enchant, entrant, etchant, explant, fondant, formant, gallant, gardant, gellant, hydrant, implant, instant, intrant, issuant, iterant, jessant, mediant, migrant, mordant, odorant, operant, oxidant, pageant, passant, peasant, peccant, pendant, pennant, piquant, pissant, pulsant, radiant, rampant, reboant, regnant, regrant, reliant, remnant, replant, reptant, saltant, sealant, seawant, sejeant, servant, sextant, spirant, statant, titrant, ululant, unmeant, vagrant, valiant, variant, verdant, versant, vibrant, warrant

8-letter words

aberrant, abradant, absonant, abundant, accusant, adjutant, adjuvant, aliquant, alterant, ambulant, arrogant, ashplant, aspirant, assonant, bacchant, bouffant, claimant, colorant, constant, corybant, cosecant, cotenant, couchant, covenant, debutant, dilatant, displant, dominant, eggplant, elephant, emigrant, equitant, evacuant, excitant, exhalant, exsecant, exultant, faineant, figurant, flagrant, flippant, fragrant, fumigant, galavant, galivant, grievant, guardant, habitant, hesitant, ignorant, incitant, indicant, inerrant, inhalant, insulant, insurant, inundant, irritant, jubilant, libelant, litigant, merchant, militant, misplant, nauseant, obeisant, occupant, oppilant, oscitant, osculant, penchant, permeant, petulant, pheasant, pieplant, pleasant, poignant, pregnant, preplant, puissant, pursuant, quadrant, reactant, recreant, recusant, relaxant, relevant, resonant, retirant, revenant, roborant, ruminant, rutilant, saturant, sergeant, serjeant, setenant, sibilant, simulant, sonorant, stagnant, supplant, tolerant, toxicant, undulant, unpliant, urticant, vegetant, vesicant, vigilant, visitant, volitant, waxplant

9-letter words

absorbant, acceptant, accordant, allegiant, annuitant, appellant, appendant, applicant, arrestant, ascendant, assailant, assistant, attendant, benignant, brilliant, celebrant, chatoyant, clinquant, coagulant, cognizant, combatant, compliant, confidant, conjugant, consonant, cormorant, corposant, coruscant, covariant, crepitant, croissant, culminant, declarant, defendant, defoliant, demandant, deodorant, dependant, desiccant, disputant, dissonant, examinant, executant, expectant, exuberant, fabricant, fluctuant, fulgurant, fulminant, gallivant, humectant, immigrant, important, incessant, indignant, inebriant, inelegant, infestant, informant, injectant, inoculant, intendant, intrigant, invariant, itinerant, leadplant, libellant, lubricant, luxuriant, malignant, mendicant, miscreant, negotiant, nonextant, nonmutant, nurturant, obscurant, observant, officiant, overplant, palpitant, penetrant, pollutant, postulant, procreant, pustulant, reductant, redundant, reentrant, regardant, reimplant, reluctant, repellant, repentant, repugnant, resistant, resultant, retardant, revertant, segregant, sterilant, stimulant, subtenant, suppliant, susurrant, sycophant, termagant, tremulant, trenchant, trepidant, ungallant, vicariant

10-letter words

accelerant, accountant, adulterant, attractant, codominant, cohabitant, commandant, concordant, congregant, consultant, contestant, continuant, conversant, convulsant, denaturant, depressant, descendant, detoxicant, discordant, discrepant, discussant, disenchant, dispersant, euphoriant, exorbitant, flagellant, flamboyant, flocculant, hierophant, houseplant, illuminant, impregnant, impuissant, incogitant, inconstant, inhabitant, insouciant, interplant, intolerant, intoxicant, intriguant, irrelevant, lieutenant, manservant, ministrant, multiplant, nonchalant, nondeviant, nondormant, nonmigrant, plainchant, propellant, protectant, protestant, pursuivant, registrant, resemblant, restaurant, retreatant, solicitant, submediant, supergiant, supplicant, surfactant, topgallant, transplant, triumphant, unarrogant, unpleasant, unpregnant, vociferant

11-letter words

appurtenant, clairvoyant, codefendant, communicant, complainant, complaisant, concomitant, conflagrant, contaminant, corroborant, determinant, equidistant, equilibrant, expectorant, extravagant, gesticulant, incognizant, incompliant, inconsonant, inobservant, interactant, maidservant, manifestant, matriculant, nonconstant, nondominant, nonirritant, nonmilitant, nonpregnant, nonrelevant, nonresonant, nonruminant, participant, precipitant, predominant, protuberant, recombinant, refrigerant, remonstrant, reverberant, scintillant, significant, subdominant, supernatant, suppressant, surveillant, transhumant, unbrilliant, undertenant, unimportant, unreluctant, unrepentant, unresistant

12-letter words

administrant, bipropellant, concelebrant, cosurfactant, decongestant, discriminant, disinfectant, disinfestant, misdemeanant, noncombatant, nonimmigrant, nonmalignant, nonobservant, nonredundant, nonresistant, overabundant, overdominant, premalignant, preponderant, recalcitrant, rehabilitant, semidominant, somnambulant, transductant, ultradistant, unflamboyant

13-letter words

equiponderant, hypervigilant, insignificant, intransigeant, introgressant, nonintoxicant, overexuberant, sublieutenant, superabundant, supermilitant, ultramilitant

14-letter words

cryoprotectant, homotransplant, monopropellant, nonparticipant, nonrecombinant, nonsignificant, pseudopregnant

15-letter words

counterirritant, overextravagant

17-letter words

immunosuppressant