2 Syllables: SU
boredom, chromium, cordon, corinth, dormant, florence, forefront, foreign, foreman, foremen, fortune, forum, georgian, gordon, gordon's, horseman, horsemen, horton, jordan, laurence, laurent, lawrence, morgan, morgan's, mormon, mortem, morton, norman, norton, odium, opium, orange, ordnance, organ, ormond, orphan, portion, portland, quorum, scorpion, shorten, sodium, sportsman, thornton, torrent, torsion, warden, warrant, warren, wharton
3 Syllables: USU
abhorrence, abhorrent, abortion, absorbent, absorption, accordance, accordant, adornment, ammonium, apportion, assortment, concordance, consortium, contortions, custodian, decorum, deportment, discordant, distortion, emporium, encomium, endorsement, enforcement, eulogium, extortion, historian, importance, important, informant, ionian, misfortune, mongolian, napoleon, napoleon's, newtonian, opprobrium, performance, petroleum, proportion, smithsonian, symposium, theologian, utopian, victorian, westmoreland
4 Syllables: UUSU
auditorium, babylonian, californian, disproportion, ethiopian, pandemonium, reinforcement, unimportant
Found 103 words across 3 groupings. Skipped 27 excess words of a similar stem.