Or search: shew, vouch, affirm, embody, verify, confirm, realise, realize, sustain, validate, actualize, incarnate, actualise, strengthen, corroborate
4 Syllables: SUUU
deviated, expiated, mediated, permeated, radiated, satiated, vitiated
5 Syllables: USUUU
abbreviated, affiliated, alleviated, appreciated, appropriated, conciliated, delineated, depreciated, emaciated, enunciated, humiliated, infuriated, initiated, irradiated, negotiated, propitiated, retaliated
6 Syllables: UUSUUU
differentiated, uninitiated
7 Syllables: UUUSUUU
undifferentiated

Found 27 words across 4 groupings.