Perfect rhymes:
* Calculate
* Accumulate
* Dissimulate
* Exculpate
* Inculcate
* Stimulate
Near rhymes:
* Emigrate
* Emanate
* Articulate
* Celebrate
* Contemplate
* Educate
* Imitate
* Operate
* Populate
* Regulate
* Relate
* Stipulate
* Vacate
These are just a few examples, and the best rhyme will depend on the specific context of your sentence or poem.