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.
croton crouton craton carton cartoon cardoon carotin carrotin carotene cartoony cretonne cortin cardon cretin cordon cortina creatin curtain creatine cowritten gratin gratine greaten grutten guerdon keratin quartan gratinee gueridon
croton proton triton ratoon cartoony cartoon carton carrotin carotin cardoon bridoon burton ratton bradoon baryton baritone rhyton rattoon craton crouton parton barytone lardoon tortoni tritone
cart carte corody crate crit croute crowd crowdie crowdy curt grot grotto grotty scrod scrota