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.
crepey crepe crepy creepy creepie creep crape cripe grapey crappy croupe gripey croupy carp crop crap carpi croup grape grapy gripe gripy grope kreep grippe grippy crappie croppie
crepey repay ropey creepie creepy crepe crepy grapey gripey prepay preppy drapey
care core crew cure acre ocrea ocreae scree screw screwy