2 Syllables: SU
7, Aaron, Baron, barren, beckon, Bedlam, Belgian, Belgium, bellum, Bremen, brethren, Breton, cession, Cheltenham, Clarence, Clemens, Clement, crescent, currant, deaden, deference, Devon, Edwin, Ellen, errand, errant, Essen, essence, Evan, felon, freshened, harem, heaven, Helen, heron, Hessian, Karen, leaden, leaven, Leben, legend, lemon, Lenin, lessen, lesson, melons, Nelson, Nelson's, parent, peasant, Pelham, penance, pennant, pheasant, pleasant, Plenum, preference, presence, present, pression, Preston, question, reckon, reddened, reference, resin, Reverend, second, Selden, seldom, session, seven, Sharon, Sheldon, Stephens, tenant, Terence, threaten, twelvemonth, vellum, venom, veteran, weapon, welcome, weren, Weston
3 Syllables: SUU
3 Syllables: USU
aberrant, accession, aggression, apparent, assessment, compression, concession, confession, contestants, depression, digression, discretion, expression, fluorescent, forbearance, impression, incessant, inherent, intestine, investment, Lieutenant, Magellan, obsession, oppression, possession, predestined, procession, profession, progression, quiescence, quiescent, quintessence, rebellion, recession, regression, repellent, repression, secession, succession, suppression, transgression, transparent, unpleasant, unwelcome
4 Syllables: UUSU
acquiescence, adolescence, adolescent, cerebellum, convalescence, convalescent, effervescence, evanescent, incandescent, indiscretion, intercession, iridescent, Mahometan, obsolescence, omnipresence, omnipresent, phosphorescent, prepossessions, retrogression
Found 152 words across 4 groupings. Skipped 55 excess words of a similar stem.