Or search: rail, barrier, railing, banister, baluster, balusters
2 Syllables: SU
bachelor, bachelor's, traveler
3 Syllables: SUU
amateur, barrister, caliber, calibre, flatterer, gatherer, grandmother, janitor, Lancaster, Latimer, manager, massacre, taciturn, traveller, vascular
4 Syllables: USUU
ambassador, coadjutor, diameter, examiner, parameter
6 Syllables: UUUSUU
cardiovascular

Found 24 words across 4 groupings. Skipped 18 excess words of a similar stem.