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.
cartoony cartoon carton cardoon croton craton cardon crouton carotin carrotin carotene cretonne cordon cortin cretin cortina creatin curtain quartan creatine cowritten garden gratin
cartoony ratoon rattoon cartoon
cart carat carate caret carrot carroty carte acaroid ecarte scart