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.
slow sallow slaw solo slew silo sloe sallowy sel sal sol sly saul sulu sail soul soli sill sole seal sell soil slay sale syli sall seel slue sola sally seely selah selle silly solei sully cello
low allow shallow wallow slow plow mellow glow callow hollow hallow follow flow fellow fallow blow billow below bellow alow mallow pillow sallow tallow willow yellow lo