I've taken a list of English words, and examined each of them to see what they sound like (using the PHP metaphone function). This page lists the most common metaphone codes, along with their words. You can also search for a word of your own, and see which words sound similar - and which ones rhyme, and which ones alliterate.
ratteen ratten rotten rattan ratton written rattoon ratan reattain ratoon retene ratany ratine redden redeny rutin radon redan redon radian redone retain retine retune rhyton ridden retinae retinue routine
potteen ratteen teen sitten written ratten teeny batten bitten fatten gotten lateen kitten latten litten mitten patten poteen rotten sateen shotten ten
rate ratty rotte bratty irate crate grate orate prate urate rat