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.
seen sen sene sewn scene scena seine senna sienna sin syn sun son sign sinh snow sone soon sine sown sawn sane snaw sunn sain syne zein hyson sauna scion sinew snowy sonny sunna sunny xenia
been keen queen peen seen teen ween wheen sheen en