Or search: podiatrist, specialist
3 Syllables: SUU
botanist, choleric, colonist, Dominic, dramatist, obelisk, opposite, politic, talkative
4 Syllables: USUU
Apocalypse, apologist, biologist, cooperatives, corroborative, economist, geologists, immoderate, prerogative, provocative
5 Syllables: UUSUU
anthropologist, archaeologist, physiologist, sociologist

Found 23 words across 3 groupings. Skipped 13 excess words of a similar stem.