2 Syllables: SU
beardless, British, ceaseless, cheerless, clearest, climates, clinics, crickets, critics, cypress, diets, digits, districts, edicts, Felix, finis, finish, Finnish, freest, greenish, heedless, helix, iris, Irish, islets, limits, lyrics, mystics, nicest, peerless, peevish, penis, Philips, Phillips, Phoenix, Phyllis, physics, pierces, prefix, quickest, realist, Regis, Rhenish, rickets, secrets, spirits, stylish, Swedish, thesis, thickest, thinness, thinnest, tickets, visits, whitish, Willis, wireless
3 Syllables: USU
arthritis, conciseness, diminish, extremist, idealist, linguistics, Osiris, resistless, specifics, statistics, uncleanness, unfinished
3 Syllables: UUS
4 Syllables: UUSU
5 Syllables: UUUSU
Found 76 words across 5 groupings. Skipped 7 excess words of a similar stem.