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.
spurs sapours spars spurries spurreys spurious sparse spiers sprays spares sapors sprees spires spears spores sprues speers speirs sopors supers spoors sippers suppers spireas soapers sappers saporous sparrows spiraeas suppress sapphires spruce sprucy zappers zippers sporozoa superrace
purs spurs cyprus sippers apers boppers hoopers rippers mopers cappers loppers lappers knappers kippers pursy nippers hoppers coopers coppers vapors rappers loopers wrappers gyppers sopors lepers jeepers poppers beepers yaupers topers shoppers shapers tappers chippers wipers dopers whoopers whappers uppers leapers peppers vapours repours paupers tapers guipures diapirs copras suppers zippers sapours vipers apres papers reapers rapers nappers keepers coppras copers pours purrs gawpers puris gapers mappers cypres hopers pars japers pros purse cuppers hypers lippers lopers gippers capris quippers moppers peepers heapers soapers zappers supers repros diapers ropers dupers sappers capers sapors spars pipers toppers weepers whippers dippers whoppers cheepers tapirs choppers shippers tippers yappers yawpers
spurrey spurry spur supra spar spare sparrow sparry spiraea spire spirea spore spray spree sprue spry spiry osprey