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.
coon con conn cony goon coni cone coin goony coney coign goonie gooney can cain cane gone gown kaon koan canna canny canoe gonia koine quoin
boon coon goon loon moon noon poon soon zoon toon shoon on
coo cooee cooey coocoo cook cookey cookie cooky