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.
creepies creeps crepes crappies croppies kreeps cripes crapes croupes groupies craps carps corps crops carpus gropes gripes grapes croups corpus grippes croupous gorps grips corpse groups
creepies harpies herpes crappies crepes croppies groupies preppies sharpies
creep creepie creepy crepe crepey crepy kreep