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.
creepy creep crepy crepey creepie kreep crepe croupy crappy carp crap crop gripy grapy carpi croup cripe crape croupe grapey gripey grippy crappie croppie
creepy repay creep crepey crepy kreep prepay preppy
care core crew cure gree acre ocrea ocreae reeker reekier scree screw screwy cheekier