Or search: enmity, dislike, tension, hindrance, hostility, hinderance, biochemistry, interference
4 Syllables: SUUU
aphorism, cataclysm, catechism, mannerisms, mechanisms, naturalism, organisms
5 Syllables: USUUU
anachronism, antagonism, fanaticism, metabolism
6 Syllables: UUSUUU
microorganisms

Found 12 words across 3 groupings. Skipped 1 excess word of a similar stem.