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.
sers sears seres seers suers serows sieurs serous series serosa serais sris sirs serious sierras seeress serosae serries saros suras soars sores sours sires ceros sorus ceres zeros soras xerus saris sirras surahs zeroes cerias cereus cerous surras sirees sarees sirrahs sirrees soirees sorrows souaris surreys sauries cerci
beers jeers shiers cheers tiers deers sers ruers peers ers veers viers hers hoers biers goers cooers kiers queers queuers leers liers hypers piers seers suers doers wooers sheers shoers
ser sera serai sere serow serry