Or search: imply, logic, assert, connote, proclaim, asseverate, interrelate
2 Syllables: SU
separate
3 Syllables: SUU
celebrate, decorate, dedicate, delegate, deprecate, desolate, educate, elevate, emanate, emigrate, estimate, extricate, generate, hesitate, meditate, penetrate, retrograde, segregate, separates, venerate
4 Syllables: USUU
accelerate, commemorate, confederate, degenerate, disseminate, effeminate, indelicate, interrogate, investigate, necessitate, perpetuate, regenerate
5 Syllables: UUSUU
overestimate, underestimate

Found 35 words across 4 groupings. Skipped 13 excess words of a similar stem.