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.
rappees rapes rupees raps ropes wraps ripes repps reaps reps rips reoppose repos roups repass repays repose rupiahs
rappees pees yippies chippies whoopees topees teepees nappies puppies poppies popes pipes peeps pappies buppies nappes koppies guppies hippies veepees epees rupees tepees toupees chappies shoppes yuppies pes
rappee rape frappe crape crappie crappy grape grapey grappa drape drapey rap