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.
soon son zoon sone sown scion hyson sonny sin syn sen sun cion zona sine zone sign sane sene sunn syne sinh sain sewn seen sawn snow snaw snowy sunna scene sinew senna seine sauna zonae sunny scena
boon coon goon loon moon noon poon soon zoon toon shoon on