Perfect rhymes:
* animator
* congregator
* deteriorator
* elevator
* exterminator
* investigator
* mediator
* propagator
* regulator
* simulator
* terminator
Near rhymes:
* agitator
* collaborator
* decorator
* educator
* evaluator
* innovator
* legislator
* moderator
* negotiator
* originator
* prosecutor
* realtor
* validator
You can choose the best rhyme based on the context of your sentence.