Perfect rhymes (not very common):
* Catch (but this sounds more like "catch")
* Match (same as above)
Near rhymes (similar vowel sounds):
* Back
* Black
* Crack
* Hack
* Lack
* Pack
* Snack
* Track
Eye rhymes (look similar but don't sound the same):
* Batch
* Latch
* Watch
It's important to note that the perfect rhymes for "Rach" are quite uncommon and the near rhymes are the most likely to be used.