Or search: avow, fink, induct, squeal, attorn, avouch, adjudge, concede, confess, declare, involve, profess, readmit, sustain, initiate
2 Syllables: SU
bigot, brigands, christened, fitted, frigate, frigid, glistened, idiot, knitted, liquid, listed, listened, pickets, pitted, printed, quickened, rigid, sickened, stiffened, Symonds, Synod, thickened, thickets, ticket, twisted, vivid, wicked, wicket
3 Syllables: USU
assisted, commissioned, conditioned, consisted, constricted, convicted, deliberate, depicted, emitted, envisioned, exhibits, existed, imprisoned, inhibit, insipid, insisted, omitted, partitioned, permitted, petitioned, positioned, predicted, prohibit, resisted, restricted, submitted, transmitted
4 Syllables: UUSU
contradicted

Found 56 words across 3 groupings. Skipped 8 excess words of a similar stem.