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.
creeps creepies kreeps crepes carps corps craps crops crapes croups corpse cripes carpus corpus croupes croppies croupous crappies gorps grips grapes gripes gropes groups grappas grippes carapace groupies
creeps kreeps rappees reaps repos repps reps rupees arepas crepes perps preops preps
creep creepie creepy crepe crepey crepy kreep