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.
snow snowy sown snaw sinew sinewy son syn sen sin sun seen sene sone sane sain sign sawn sunn sewn syne soon sine sinh hyson sauna scion seine senna sonny sunna sunny scena scene
know now enow minnow snow winnow no