Or search: prater, talker, babbler, speaker, cotinga, spouter, utterer, verbaliser, verbalizer
2 Syllables: SU
bachelor, bachelor's, traveler
3 Syllables: SUU
amateur, aperture, caliber, flatterer, gatherer, janitor, Latimer, manager, massacre, traveller, vascular
4 Syllables: USUU
ambassador, coadjutor, diameter, examiner, parameter
5 Syllables: UUSUU
manufacturer
6 Syllables: UUUSUU
cardiovascular

Found 21 words across 5 groupings. Skipped 15 excess words of a similar stem.