2 Syllables: SU
beaches, beeches, breaches, breezes, ceaseless, ceases, cheeses, clearest, cleavage, creases, eases, edict, Edith, Egypt, Felix, fiendish, freest, freezes, Friedrich, greenish, Greenwich, heedless, helix, leakage, leases, leeches, lyric, meekness, nieces, peaches, peevish, penis, Phoenix, pieces, pleases, preaches, prefix, reaches, realism, realist, Regis, Rhenish, scenic, secret, seemeth, seizes, sieges, speeches, spirit, Swedish, teaches, thesis, zenith
3 Syllables: SUU
3 Syllables: USU
acetic, adhesive, albeit, cohesive, collegiate, diseases, extremist, releases, satiric, strategic, uncleanness
3 Syllables: UUS
4 Syllables: UUSU
5 Syllables: UUUSU
Found 70 words across 6 groupings. Skipped 7 excess words of a similar stem.