1 Syllable: S
2 Syllables: SU
7, aaron, arid, barium, baron, barren, beckon, bedlam, bellum, breasted, bremen, brethren, breton, burthen, carrion, cession, chairman, cherub, clarence, clarion, clemens, clement, crescent, currant, deaden, deference, devon, ebbed, edwin, ellen, errands, errant, essen, essence, evan, felon, fetid, freshened, harem, headed, heaven, helen, herdsman, herod, heron, hessian, karen, leaden, leaven, leben, legend, lemon, lenin, lessen, lesson, marion, melon, method, nested, parent, peasant, pelham, penance, pennant, petted, pheasant, pleasant, plenum, preference, presence, present, pression, preston, question, reckon, reddened, reference, resin, rested, reverend, second, serfdom, session, seven, sharon, stephens, tenant, terence, threaded, threaten, variance, variant, vellum, venom, veteran, weapon, wedded, weren, weston
3 Syllables: SUU
3 Syllables: USU
aberrant, accession, aggression, agrarian, apparent, aquarium, arrested, assessment, barbarian, bavarian, bulgarian, compression, concession, confession, congested, contestants, contested, depression, digression, discretion, expression, fluorescent, forbearance, grammarian, hungarian, impairment, impression, incessant, inherent, interment, intestine, intrepid, invested, investment, librarian, lieutenant, magellan, obsession, oppression, ovarian, possession, predestined, preferment, presented, procession, profession, progression, quiescence, quiescent, quintessence, recession, regression, relented, repellent, repression, requested, resented, secession, sectarian, succession, suggested, suppression, transgression, transparent, unpleasant
4 Syllables: UUSU
acquiescence, adolescence, adolescent, antiquarian, cerebellum, convalescence, convalescent, effervescence, evanescent, incandescent, indiscretion, intercession, iridescent, mahometan, obsolescence, omnipresence, omnipresent, phosphorescent, prepossessions, proletarian, represented, retrogression, unitarian, vegetarian
5 Syllables: UUUSU
Found 199 words across 6 groupings. Skipped 57 excess words of a similar stem.