Hydrate rhymes with:
carbohydrate, carbohydrate, carbohydrate, administrate, airfreight, arbitrate, birthrate, calibrate, carbohydrate, castrate, celebrate, concentrate, consecrate, demonstrate, denigrate, disintegrate, emigrate, frustrate, gyrate, illustrate, immigrate, infiltrate, integrate, interestrate, magistrate, migrate, narrate, nitrate, orchestrate, penetrate, perpetrate, reintegrate, serrate, substrate, vertebrate
Hydrate sounds like:
hatred, hitherto, hotard, hotwired, hydrated, hydride