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.
gaen gan gaun guan gane gain guano guanay goanna ken can gun gown kain keno gone keen kaon cain cane kana goon koan kane canna canny canoe coign gonia goony gunny quean queen