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.
crepy crepey creepy creep crepe croupy crappy crap carp crop creepie gripy carpi grapy crape cripe croup kreep croupe grapey gripey grippy crappie croppie gorp grip
crepy rep chirrupy charpoy sirupy prepay preop reap repay repo repp ropy arepa creep harpy creepy crepe crepey grapy gripy kreep prep preppy syrupy chirpy sharpy
care core crew cure acre ocrea ocreae scree screw screwy