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.
silo soil sail sill solo sloe slow silly scilla sallow sly sel sal sol sallowy ceil slew slay sola slaw syli slue sole sall saul sell seal soul zill soli seel sulu sale ceili seely selah selle solei sully cello cilia sally