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.
seely seel sly sel slay seal sell silly sully sally selah selle sal sol cel sallowy soli syli sola solo sole silo soil slue sail sill soul slaw sloe ceil cell slew slow sall sale saul sulu zeal
eely seely eel wheel weel teel delay rely feyly seel relay peel belay belly feel felly vealy mealy kneel nelly newly jelly reel delly heel telly keel welly kelly shelly