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.
guan guano gun gan guanay gaen gain gane gaun gunny quean goanna guinea can kana quin kaon kuna cain kane gone cane goon kain koan kune gown canna canny canoe coign gonia goony queen quoin