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.
carpus carps corpus corps craps crops croupous crapes croups crepes corpse creeps cripes croupes croppies carapace creepies crappies gorps grips grapes gripes gropes groups kreeps grappas grippes groupies
corpus carpus bewraps wraps rips reps raps crops burps gorps preps larrups sirups syrups drips hydrops trappous trips urps chirps sharps props euripus fraps rewraps herpes carps corps corpse craps croupous harps grips priapus perps sourpuss dorps drops tarps traps turps warps chirrups sherpas
carp carpi crap crape crappie crappy crepe crepey crepy cripe crop croppie scarp