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.
seel seely sel sell seal selle selah sal sol cel sly cell sulu slow soli soul sole slaw sale ceil sail zeal solo sloe sill sall saul slue syli sola slew silo slay soil ceili cella celli cello sally silly solei sully zoeal
eel feel heel keel kneel peel reel seel teel weel wheel el