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.
crepe crepey creepie creep crape crepy cripe croupe creepy crop carp crap croup grope gripe grape carpi kreep crappy croupy grapey gripey grippe crappie croppie gorp grip
crepe rep tripe drupe serape pyrope preop kreep gripe rape reap repo repp ripe rope crape arepa creep creepie crepey crepy cripe grape grope hyperope prep sarape drape towrope trope
care core crew cure acre ocrea ocreae scree screw screwy