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
2 Syllables: US
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, Westmoreland
4 Syllables: UUSU
auditorium, Babylonian, Californian, disproportion, Ethiopian, pandemonium, reinforcement, unimportant
Found 103 words across 4 groupings. Skipped 27 excess words of a similar stem.