Or search: heresy
4 Syllables: SUUU
Calvinism, communism, formalism, heathenism, humanism, mechanism, organism, paganism, unionism
5 Syllables: SUUUU
Puritanism
5 Syllables: USUUU
anachronism, antagonism, colonialism, determinism, sectarianism
6 Syllables: USUUUU
Americanism, republicanism
6 Syllables: UUSUUU
microorganisms
7 Syllables: UUUSUUU
utilitarianism

Found 19 words across 6 groupings. Skipped 1 excess word of a similar stem.