2 Syllables: SU
blighted, blinded, brightened, 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, United, 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.