2 Syllables: SU
ambient, Ammon, annum, Anson, anthem, Bantam, Brandon, cadmium, Camden, cannon, canon, Canton, Canyon, champion, dampened, famine, Franklin's, ganglion, grandson, Hammond, Hampden, Hampton, handsome, hangman, Hansen, Hanson, Langdon, Mammon, mansion, phantom, plantain, rampant, random, ransom, salmon, Sampson, sanction, sanctum, Shannon, Stanton, tandem, tangent, transient
3 Syllables: USU
abandon, advancement, Buchanan, Byzantium, commandment, companion, embankment, enchantment, enhancement, examined, examines, expansion, Northampton, Southampton
4 Syllables: UUSU
Found 60 words across 3 groupings. Skipped 20 excess words of a similar stem.