4 Syllables: SUUU
aggravating, aggregating, agitating, allocating, animating, decorating, fascinating, generating, graduating, liberating, moderating, navigating, operating, separating, tolerating, vacillating
5 Syllables: USUUU
accelerating, ameliorating, collaborating, commemorating, congratulating, contaminating, cooperating, degenerating, deliberating, deteriorating, enumerating, eradicating, evaporating, exaggerating, exasperating, exhilarating, inaugurating, incorporating, invigorating, obliterating, regenerating, reiterating
Found 38 words across 2 groupings.