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