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.
snowy snow sinewy sown snaw sunny sonny sinew sawney syn sun son sin sen sone syne sign sine sain sawn sunn soon sewn sene seen sinh sane zany
snowy now know annoy enow minnow known sinewy snow downy tannoy towny winnow