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.
sirras sierras sirrahs surras sirs sirrees soras sires suras cirrus sieurs serais surahs sirees serries sorrows surreys cirrous soirees cirrose sris sers suers sorus sours soars seers seres saris cires sores sears saros serous serosa cerias series serows sarees zaires sauries seeress serious serosae souaris
arras murras durras surras terras sirras sierras ras morays sirrahs burrs raws murrs brass braes soras hurrahs areas muras suras hurrays maras paras myrrhs kerrias derays koras braws dorrs prays cerias morass rase serais prase parrs proas phrase drays tiaras sherris churrs choreas chirres charros whirrs ureas yttrias trass toras rais tarres hydras varias boreas morros douras barres horahs norias arrays auras gnarrs moras rays jarrahs cirrus praus gerahs morris craws hydrase cuirass nairas currs gharris murres arris surahs crass bras eyras liras errs varas erase grass lauras draws harass frass orris frays ferias eras purrs terais bewrays burros forays praos horas buras carrs boras hoorahs rias dourahs grays arias birrs mbiras brays duras hoorays durrs derris gyrase torahs torrs trays urase whereas charas charrs chirrs churros sharias shirrs yirrs
sirra sirrah sirree sir cirri serry sierra sire siree soiree sorrow sorry surra surrey