Or search: actifed, antivert, dramamine, coricidin, phenergan, medication, medicament, pyrilamine, pheniramine, promethazine, methapyrilene, dimenhydrinate, cyproheptadine, diphenhydramine, phenyltoloxamine
2 Syllables: SU
difference, different, interim
3 Syllables: SUU
Christendom, Chrysostom, cinnamon, citizen, discipline, dissonance, filament, immanent, immigrant, imminence, imminent, innocence, innocent, irritant, ligament, militant, minimum, silicon, vigilance, vigilant, virulence, virulent
3 Syllables: USU
deliverance, indifference, indifferent
4 Syllables: USUU
ambivalence, ambivalent, belligerent, Dominican, equivalence, equivalent, habiliments, imprisonment, itinerant, magnificent, munificence, omnipotence, omnipotent, participant, predicament

Found 43 words across 4 groupings. Skipped 11 excess words of a similar stem.