Or search: oscine, babbler, timalia
2 Syllables: SU
bachelor, bachelor's, traveler
3 Syllables: SUU
amateur, caliber, flatterer, gatherer, janitor, Latimer, manager, massacre, tabular, traveller, vascular
4 Syllables: USUU
ambassador, coadjutor, diameter, examiner, oracular, parameter, spectacular, vernacular
6 Syllables: UUUSUU
cardiovascular

Found 23 words across 4 groupings. Skipped 12 excess words of a similar stem.