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