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.
guid guide quid gude gaud gaudy cud gut god kid gad good quit gadi quod gout kudo kudu qaid goad gait cued gaed caid gowd quad gouty coude quite kiddy goody quiet kiddo gutty cutie cuddy gaddi gutta quoit