Or search: delegating, delegation, devolution, deputation, relegation, devolvement, authorization, authorisation
4 Syllables: SUUU
aggregating, celebrating, decorating, deprecating, desolating, devastating, educating, elevating, emanating, emigrating, estimating, generating, hesitating, irrigating, meditating, mitigating, navigating, penetrating, propagating, separating
5 Syllables: USUUU
accelerating, commemorating, degenerating, disseminating, investigating, perpetuating, regenerating

Found 27 words across 2 groupings.