2 Syllables: SU
barium, carrion, clarion, marion, requiem, variance, variant
3 Syllables: SUU
anyone's, everyone, everyone's, twentyone
3 Syllables: USU
agrarian, aquarium, barbarian, bavarian, bulgarian, compendium, equestrian, grammarian, hungarian, librarian, millennium, ovarian, pedestrian, sectarian
4 Syllables: UUSU
antiquarian, proletarian, unitarian, vegetarian
5 Syllables: UUUSU
authoritarian, disciplinarian, egalitarian, humanitarian, totalitarian, utilitarian

Found 35 words across 5 groupings. Skipped 6 excess words of a similar stem.