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.
paupers papers pipers pauperize peepers peppers poppers poperies papyrus paparazzi paparazzo
paupers dupers supers yaupers rappers peres copperas dippers coappears apers japers piers rapers loppers nippers uppers loopers knappers soapers coppers spiers gawpers peepers papers mopers kippers capers nappers shoppers lepers shapers chippers gippers wipers whoopers ropers whappers reappears pipers peris topers zippers gapers cuppers speers suppers perse sappers lappers tappers wrappers appears hoppers tapers peppers pears whippers boppers toppers gyppers leapers heapers moppers shippers speirs copiers reapers coopers hopers peers beepers lopers copers jeepers cheepers keepers choppers rippers poppers quippers spears vipers operas cappers hypers sippers hoopers lippers diapers dopers rapiers mappers tippers weepers whoppers yappers zappers yawpers