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.
crockery crookery croaker cracker crooker croakier corker corkier creakier groggery caracara craggier groggier quirkier
rockery trickery crockery trickier racker rocker rockier rookery wrecker barracker brickier crookery pricker prickier tracker tricker cracker trucker
crock croc crack cracky crick crickey croak croaky crook cruck