Or search: divisor, fractional
2 Syllables: SU
cabinet
3 Syllables: SUU
adequate, aggregate, animate, aqueduct, graduate, naturalist, passionate, satirist
4 Syllables: USUU
antagonist, compassionate, dispassionate, inadequate, inanimate, protagonist
5 Syllables: UUSUU
undergraduate

Found 16 words across 4 groupings. Skipped 7 excess words of a similar stem.