Or search: divergent, diverging
4 Syllables: SUUU
deviating, mediating, obviating, permeating
5 Syllables: USUUU
alleviating, appreciating, appropriating, associating, conciliating, delineating, depreciating, excruciating, humiliating, initiating, negotiating, officiating, repudiating
6 Syllables: UUSUUU
differentiating

Found 18 words across 3 groupings.