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.
sen sewn seen sene scena scene seine senna syn son sin sun sienna sown sane sunn snow soon sine sign snaw sone sain zein sawn sinh syne sinew scion sunny hyson sonny sunna snowy xenia sauna sawney sinewy sunnah