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.
carotene carotin carrotin croton carton cardon crouton cartoon cardoon cretonne cartoony creatine cowritten cretin garden cordon craton cortin creatin gratine greaten grutten quartan gardenia gratinee gratin
carotene retene rotten protean protein serotine torten chorten shorten
cart carat carate caret carrot carroty carte croute garote garotte acaroid ecarte scart scrota