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.
soil sol sill soli sola soul silo sail sole solo silly solei scilla sal sel sly ceil zill saul sulu slaw seal sall slue slay sale slow seel sloe sell syli slew ceili cilia sally seely selah selle sully zoeal
boil foil coil moil noil oil reoil roil soil toil