Perfect rhymes (same vowel sound and ending):
* There aren't any!
Near rhymes (similar vowel sound, different ending):
* Chain
* Brain
* Gain
* Pain
* Strain
* Slain
Eye rhymes (look similar, but don't sound the same):
* Plain
* Reign
Words that rhyme in a different way:
* You can use words that rhyme with the "main" part, like "drain," "remain," "stain," etc.
Ultimately, the best rhyming word will depend on the context and the specific meaning you're trying to convey.