Or search: belt, crook, felon, adjunct, fitting, fixings, abetter, abettor, vesture, criminal, henchman, wearable, adjuvant, ancillary, auxiliary
2 Syllables: SU
every, feathery
3 Syllables: SUU
Beverly, charities, Chesterfield, cleverly, destinies, elegies, enemies, enemy's, evergreen, Genevieve, heresies, jealousies, leathery, legacies, lethargy, melodies, memories, parodies, pedigrees, Pericles, recipes, remedies, reverie, treachery, treasuries, treasury, verities, westerly, yesterday, yesterday's
4 Syllables: USUU
accessory, amenities, barbarities, disparities, extremities
5 Syllables: UUSUU
similarities
6 Syllables: UUUSUU
irregularities, peculiarities

Found 40 words across 5 groupings. Skipped 2 excess words of a similar stem.