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.
sown son sone sawn snow sewn soon snowy hyson sonny scion sawney sin syn sen sun zone sene zona seen sunn cion sine sign sain sane syne sinh snaw zoon sauna scena scene seine senna sinew sunna sunny zonae
gown lown mown known own sown down town shown on