2 Syllables: SU
emerald, general
3 Syllables: SUU
enviable, plentiful, sensible, sensual, sentinel, temporal, tentacles, ventricle
4 Syllables: USUU
commendable, contemptible, conventional, defensible, dependable, dimensional, ephemeral, insensible, intentional, lamentable, ostensible, presentable, unenviable, unquenchable
5 Syllables: UUSUU
comprehensible, indefensible, indispensable, reprehensible, unconventional, unintentional

Found 30 words across 4 groupings. Skipped 4 excess words of a similar stem.