Or search: chin, hike, jack, pump, rear, skid, boost, exalt, favor, hoist, trice, assign, favour, leaven, modify
4 Syllables: SUUU
activating, aggravating, celebrating, decorating, deprecating, desolating, devastating, educating, emanating, emigrating, estimating, excavating, generating, hesitating, meditating, motivating, penetrating, separating
5 Syllables: USUUU
accelerating, commemorating, degenerating, disseminating, investigating, perpetuating, regenerating

Found 25 words across 2 groupings.