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.
carpel carpal carpale carpool carpalia crapola cripple graupel creepily croupily grapple gripple
carpel rappel repeal repel ripely hirple carpal graupel propel purple purply sharply
carp carpi crap crape crappie crappy crepe crepey crepy cripe crop croppie scarp