3 Syllables: SUU
4 Syllables: SUUU
aphorism, cataclysm, catechism, fatalism, federalism, feudalism, formalism, journalism, mannerisms, naturalism, pluralism, socialism, symbolism, vandalism
5 Syllables: USUUU
anachronism, antagonism, colonialism, fanaticism, imperialism, industrialism, materialism, metabolism, paternalism, provincialism
6 Syllables: UUSUUU
6 Syllables: UUUSUU
Found 28 words across 5 groupings. Skipped 2 excess words of a similar stem.