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4 Syllables: SUUU
celebrating, decorating, deprecating, desolating, devastating, educating, elevating, emanating, emigrating, estimating, fluctuating, generating, graduating, hesitating, meditating, penetrating, separating
5 Syllables: USUUU
accelerating, commemorating, degenerating, disseminating, evacuating, investigating, regenerating

Found 24 words across 2 groupings.