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.
wadset widest wattest whatsit weediest woodiest wetsuit wettest whitest whitiest wittiest
headset wadset bedsit saddest reddest odist nudist modest maddest loudest lewdest hadst haddest photoset feudist faddist disseat sawdust adust tasset dust dost midst nudest oddest outset rudest sadist sudsed didst baddest deadest widest
wads waddies wades wadies wadis wats weds woads