Or search: thrall, slavery, thraldom, vassalage, thralldom
2 Syllables: SU
Aaron, barium, Baron, barren, burthen, carrion, chairman, Clarence, clarion, currant, errand, errant, harem, herdsman, heron, Karen, Marion, parent, Sharon, Terence, variance, variant, weren
3 Syllables: USU
aberrant, agrarian, apparent, aquarium, barbarian, Bavarian, Bulgarian, equestrian, forbearance, grammarian, Hungarian, impairment, inherent, interment, librarian, ovarian, pedestrian, preferment, sectarian, transparent
4 Syllables: UUSU
antiquarian, proletarian, Unitarian, vegetarian
5 Syllables: UUUSU
authoritarian, disciplinarian, egalitarian, humanitarian, totalitarian, utilitarian

Found 53 words across 4 groupings. Skipped 10 excess words of a similar stem.