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.
craton carton croton crouton creatin cartoon cretonne creatine cartoony cortin cardon cretin gratin cordon keratin cardoon greaten carotin curtain gratine carotene carrotin gratinee cowritten gradin cortina gradine grutten guerdon quartan guardian gueridon
craton barytone triton ceratin parton greaten crouton croton creatin cartoon carton burton baryton radon baritone rhyton rattoon ratton ratoon ratan gratin keratin proton tortoni tritone
crate carat carate cart carte create crit curate curt grat grate