Or search: boor, goth, tike, tyke, churl, vandal, peasant, odoacer, barbaric, cannibal, odovakar, uncivilized, uncivilised, noncivilised, noncivilized
2 Syllables: SU
Aaron, barium, Baron, barren, burthen, carrion, chairman, Clarence, clarion, currant, errand, errant, harem, herdsman, heron, Karen, Marion, parent, requiem, serfdom, Sharon, Terence, variance, variant, weren
3 Syllables: SUU
anyone, anyone's, everyone, everyone's, twentyone
3 Syllables: USU
aberrant, agrarian, apparent, aquarium, barbarians, Bavarian, Bulgarian, equestrian, forbearance, grammarian, Hungarian, impairment, inherent, interment, librarian, millennium, ovarian, pedestrian, preferment, sectarian, transparent
4 Syllables: UUSU
antiquarian, proletarian, Unitarian, vegetarian
5 Syllables: UUUSU
authoritarian, disciplinarian, egalitarian, humanitarian, totalitarian, utilitarian

Found 61 words across 5 groupings. Skipped 9 excess words of a similar stem.