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.
goons goonies gooneys gowns coons gooeyness guns goannas cons kaons gains cones guans gonzo koans conus coins conns coneys quoins conies koines guanos guanays guanase gayness coyness guineas gunnies gainsay cans kens kins
boons coons poons goons zoons noons loons toons moons ons joins sonsy peons coins conns fons aeons gowns sons koans nones eons pons mons monos donsy owns ions wons phonos foins neons leones cons muons phones noose peones donas tauons nouns tons hones loans loins hons scions zones ones jones bones bonus knowns lions cones nonas pones conus onus monas phons paeons johns cions fohns kaons moans onos roans hysons sones pions dons downs tones quoins tonus towns yonis
goon gooney goonie goony coon goanna gone gonia gown agon agone agony