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.
ripsaw rips ripes raps reps rapes roups reaps repps ropes repos wraps repass repays repose rupees rappees rupiahs reoppose repousse
ripsaw whipsaw paws papaws pawpaws
rip ripe cripe grip gripe gripey grippe grippy gripy drip drippy trip tripe trippy