Showing results for "unionism" instead. (You can only search for 1 word at a time unless you use the Storm or Mosaic Rhyme tools)
4 Syllables: SUUU
Calvinism, communism, heathenism, humanism, mechanism, organism, paganism
5 Syllables: USUUU
anachronism, antagonism, determinism, sectarianism
7 Syllables: UUUSUUU
utilitarianism

Found 12 words across 3 groupings.