2 Syllables: SU
Abbe, abbess, Abbey, acme, active, actually, Agnes, aptly, Atkins, Bacchus, badly, baggage, Baptist, blackish, blacksmith, brackish, Bradley, cabbage, cadre, captive, craggy, Daddy, fatty, flabby, flatly, gladly, hackney, Hadley, haply, happenings, happy, Hatfield, khaki, lapses, madly, Maggie, napkins, package, paddy, Papists, practice, practise, Radcliffe, sadly, satis, shabby, shaggy, taxes, taxi, trackless, waxes, waxy
3 Syllables: USU
adaptive, attractive, collapses, combative, establish, exactly, inactive, reactive, refractive, relapses, relaxes, unhappy
4 Syllables: UUSU
5 Syllables: UUUSU
Found 70 words across 4 groupings. Skipped 10 excess words of a similar stem.