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.
cripes crapes crepes gripes grippes croupes crops corps carps grips craps croppies crappies creepies carpus gropes corpse croups corpus creeps grapes carapace croupous groupies gorps groups kreeps grappas
cripes gripes tripes ripes tropes herpes croppies traipse towropes trapes harpies crappies grapes chirps drips creepies groupies grips hyperopes pyropes serapes tripos crepes crapes liriopes ropes rupees frappes rappees drapes rips sarapes troupes preppies trips drupes euripus gropes croupes grippes rapes sharpies
cripe crepey gripy grippe gripey gripe grip croppie crop crepy crepe carp crappy crappie crape crap carpi grippy scrip