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.
tapirs tapers diapirs tappers topers topiaries diapers tippers toppers dopers dupers depress dippers duperies
diapirs tapirs coopers copiers lappers loopers reapers mopers pars apres knappers cappers zappers lepers apers capers spars gawpers kippers japers nippers peppers coppras loppers cuppers repros purs piers sapphires uppers yaupers shoppers tappers shapers chippers tapers wipers whoopers spiers whappers topers sapors poppers dopers spurs cypres suppers copras ropers soapers pairs rapiers gippers zippers paupers vipers jeepers mappers lippers copers hypers dupers heapers repairs coppers wrappers vapors keepers leapers capris papers moppers hopers peepers spires gyppers lopers capoeiras cyprus boppers rappers sopors rippers hoopers beepers rapers dippers sappers pipers gapers supers speirs quippers nappers diapers hoppers toppers weepers whippers sippers whoppers cheepers pros choppers shippers tippers yappers yawpers
tapir taper tapper topiary typier