4 Syllables: SUUU
aggravating, aggregating, allocating, animating, fascinating, graduating, hesitating, imitating, irritating, meditating, navigating, palpitating, vacillating
5 Syllables: USUUU
collaborating, congratulating, contaminating, debilitating, elaborating, eradicating, evaporating, exaggerating, exasperating, facilitating, precipitating
Found 24 words across 2 groupings.