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.
cirrate cerate serrate cerite seriate cered sired sciurid serried syrette
ferrate cirrate narrate serrate rate hydrate deaerate irate seriate phorate gyrate cerate pirate errata garrote create corrade carate prate laureate aerate orate derate ferrite lyrate muriate variate curate grate crate aurate aureate berate borate karate urate rat