Or search: gnosticism, mandaeanism
4 Syllables: SUUU
Calvinism, communism, heathenism, humanism, magnetism, mechanism, organism, paganism, pragmatism, unionism, vandalism
5 Syllables: SUUUU
Puritanism
5 Syllables: USUUU
anachronism, antagonism, determinism, romanticism, sectarianism
6 Syllables: USUUUU
Americanism, republicanism
7 Syllables: UUUSUUU
utilitarianism

Found 20 words across 5 groupings.