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.
repros repairs reapers repours repress reprise repursue reappears rapers reappraise rapiers rappers reprice rippers wrappers ropers roperies
pros repros viperous japers vaporous mopers reapers copers papers loppers pross heapers porous gapers prows sapors capris wrappers gippers apres nippers quippers keepers pyros cuppers capers biparous prosy hopers prose proso knappers toppers yaupers shoppers spars shapers chippers sippers wipers whoopers diapers whappers uprose supers tippers sopors cyprus dupers tapirs rapers dippers pipers zappers leprous rippers loopers purs peepers proas leprose leapers saporous moppers coppers hoopers gyppers peppers hypers vapors pareos cappers mappers ropers gawpers operose lepers lappers hoppers beepers parous leprosy copras rappers apers pars vipers paupers poppers praos cuprous kippers soapers lippers nappers boppers coppras porose suppers lopers diapirs jeepers tapers dopers cypres tappers coopers spurs uppers weepers zippers whippers whoppers sappers cheepers choppers sparrows shippers yappers topers yawpers
repro reaper reappear repair repour crepier prepare preppier