Or search: cell, clon, beast, brute, dwarf, fauna, flora, sport, zooid, fungus, hybrid, mascot, mortal, mutant, nekton
4 Syllables: SUUU
Calvinism, communism, formalism, heathenism, humanism, mechanism, organisms, paganism, unionism
5 Syllables: USUUU
anachronism, antagonism, determinism, sectarianism
6 Syllables: UUSUUU
microorganisms
7 Syllables: UUUSUUU
utilitarianism

Found 15 words across 4 groupings.