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.
seal sel sal saul sail zeal sell sale sall seel selle zoeal selah seely sally sallow sly cel sol sallowy soil sulu sola soul slay sloe slew ceil slaw slue silo sill cell solo slow syli soli sole ceili cella celli cello silly solei sully
feal veal wheal weal teal deal zoeal zeal seal real peal meal leal heal sheal al el