Or search: passable, travelable
3 Syllables: SUU
cervical, permeable, purposeful, terminal, versatile, vertebral, virginal, workable, worshipful
4 Syllables: USUU
convertible, discernible, impersonal, observable, reversible, transferable, unworkable
5 Syllables: UUSUU
interpersonal, irreversible

Found 18 words across 3 groupings. Skipped 1 excess word of a similar stem.