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.
karat karate kart korat kraut krait carat carate grat cart quart great crate grate garda caret groat carte quarte curate garote cardia carrot gardai create garret quarto garrote carroty garotte cardiae garrotte card crit curt grad grit grot
carat karat rat art cart crate groat grate irate rato rate korat frat hearty hart berate jurat hereat carate garda tarot tarty lariat whereat orate wart treat kraut quarte mart prate airt party aurate pirate cirrate dart derat drat karate borate cerate arty aerate errata farad fart phorate caret heart gyrate carte boart curate grat krait kart trait great tart hydrate derate deaerate serrate prat brat peart ferrate narrate lyrate quarto quart urate warty part chart
karoo karroo kauri kaury kora korai okra