2 Syllables: SU
blighted, blinded, brightened, cited, climate, cyclic, diamond, diet, eyelid, frightened, glided, guided, heightened, Highland, hybrid, Iceland, Isaac, island, islet, knighted, Leipsic, Leipzig, lighted, lightened, likened, minded, Pilate, pilot, plighted, prided, private, psychic, quiet, righted, riot, ripened, sided, sighted, slighted, stipend, tightened, viands, violet, widened, winded, Wyatt
3 Syllables: USU
affrighted, alighted, benighted, collided, confided, decided, delighted, derided, disquiet, divided, enlightened, enlivened, environed, excited, ignited, incited, indicted, inviolate, invited, misguided, presided, provided, recited, reminded, requited, resided, shortsighted, subsided, unquiet
4 Syllables: UUSU
coincided, elegiac, reunited, subdivided, ultraviolet, undecided, undivided, unenlightened, uninvited, unprovided, unrequited
Found 86 words across 3 groupings. Skipped 12 excess words of a similar stem.