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.
koan kaon kana kane kain koine goanna can gan kin con ken coni coin gain goon gown gaun coon keen kuna kine gaen gone cone gane cony kune cain keno kino conn kina guan cane canoe coign coney gonia goony guano canna canny quean quoin