Or search: l, dal, liter, litre, dekalitre
2 Syllables: SU
bachelor, bachelor's, traveler
3 Syllables: SUU
amateur, caliber, flatterer, gatherer, janitor, Latimer, manager, massacre, traveller, vascular
4 Syllables: USUU
ambassador, coadjutor, diameter, examiner, parameter
6 Syllables: UUUSUU
cardiovascular

Found 19 words across 4 groupings. Skipped 12 excess words of a similar stem.