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