Or search: decoy, unite, allied, helper, admirer, booster, steerer, champion, henchman, accessory, supporter, accessary, accomplice, protagonist, collaborator
2 Syllables: SU
Everett, separate
3 Syllables: SUU
baronet, celebrate, decorate, dedicate, deficit, definite, delegate, delicate, deprecate, desolate, educate, elevate, emanate, emigrate, estimate, etiquette, extirpate, Federalist, generate, hesitate, meditate, Methodist, penetrate, predicate, prejudiced, requisite, segregate, separates, venerate
3 Syllables: USU
electorate
4 Syllables: USUU
accelerate, commemorate, confederates, Connecticut, degenerate, disseminate, indefinite, interrogate, investigate, inveterate, necessitate, perpetuate, prerequisite, protectorate, regenerate
5 Syllables: UUSUU
Directorate, overestimate, underestimate

Found 50 words across 5 groupings. Skipped 17 excess words of a similar stem.