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