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