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.
crouton croton craton carton cartoon cardoon carotin carrotin carotene cartoony cretonne cardon cortin cordon cretin cortina creatin curtain grutten creatine cowritten gratin gratine greaten guerdon keratin quartan
croute court cruet grout grouty scrota