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.
frays forays frass fraise ferias furs firs fairs varas feres fires frees farcy froes fiars frise fries furzy fares frows fours faros fores fears frisee frouzy furies varias phrase frowzy frowsy frizzy feuars faeries furioso ferrous farrows foresaw foresee furious furrows fairies ferries ferreous gheraoes pharaohs friz vars
arrays derays trays forays grays morays brays hurrays rays hoorays bewrays drays prays frays ras koras varias mbiras gerahs sirras phrase crass boreas norias liras proas surahs buras gyrase horahs hurrahs auras muras surras frass draws preys douras duras sharias charas ureas yttrias treys trass torahs terais hydras boras bras moras praus hearsay eyras racy lauras hoorahs cerias piracy raws paras serais ferias horas sirrahs craws braws rias harass prase erase rase braes crazy nairas cuirass maras arias murreys varas arras sierras brass morass surreys kerrias jarrahs murras eras grass praos greys soras areas rais dourahs suras drys durras hydrase terras toras curacy troys urase whereas choreas tiaras