2 Syllables: SU
barium, carrion, clarion, Marion, variance, variant
3 Syllables: USU
agrarian, aquarium, barbarian, Bavarian, Bulgarian, grammarian, Hungarian, librarian, ovarian, sectarian
4 Syllables: UUSU
antiquarian, proletarian, Unitarian, vegetarian
5 Syllables: UUUSU
authoritarian, disciplinarian, egalitarian, humanitarian, totalitarian, utilitarian

Found 26 words across 4 groupings. Skipped 5 excess words of a similar stem.