Perfect rhymes (same vowel sound and ending consonant sound):
* None (It's a difficult word to rhyme!)
Near rhymes (same vowel sound but different ending consonant sound):
* felt
* melt
* welt
Eye rhymes (spelled similarly but pronounced differently):
* gelt (archaic word for money)
Slant rhymes (similar sounds but not exact):
* belt (on its own)
* helmet
* whet (to sharpen)
Other options:
* Safety belt (more descriptive and a common synonym)
* Harness (similar function)
Ultimately, the best rhyming word depends on the context of your poem or song!