Or search: rebut, unsay, disown, recant, refute, reject, abjure, resile, retract, swallow, forswear, renounce, withdraw, apostatise, apostatize
4 Syllables: SUUU
deviating, mediating, obviating, permeating, radiating
5 Syllables: USUUU
alleviating, appreciating, appropriating, associating, conciliating, delineating, depreciating, excruciating, humiliating, initiating, negotiating, officiating
6 Syllables: UUSUUU
differentiating

Found 18 words across 3 groupings.