2 Syllables: SU
50, briskly, busied, busy, Ceres, Christi, Christie, cities, city's, dizzy, fifties, fifty, grisly, grizzly, guineas, history, Lichfield, lilies, Livy, misty, pithy, pities, pristine, privy, queries, richly, risky, Ritchie, series, Smithfield, stiffly, swiftly, theories, thrifty, whiskey, whisky
3 Syllables: SUU
fisheries, fishery, liveries, livery, miseries, misery, mysteries, mystery, Philippines, Philistines, Pyrenees, similes, tyrannies, vicarage
3 Syllables: USU
4 Syllables: USUU
abilities, affinities, antipathies, antipodes, antiquities, civilities, consistory, conspiracies, delivery, divinities, facilities, festivities, hostilities, periphery, proclivities, utilities
4 Syllables: UUSU
5 Syllables: UUSUU
6 Syllables: UUUSUU
Found 81 words across 7 groupings. Skipped 1 excess word of a similar stem.