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.
farrows furrows faros frows frowsy ferrous froes fares vrows fears ferreous fiars fairs frowzy vrouws pharos feuars various ferries furious fairies faeries gharris furioso furs firs vars pharaohs gharries frass fores varus fours fries farcy frays farci fires froze feres frise vairs farce frees varas varies frisee furies frouzy ferias varias fraise vireos farcie forays foresaw foresee
arrows barrows furrows sorrows farrows burrows yarrows marrows morrows narrows borrows harrows rows barrios churros cirrous trows ferrous drowse vrouws frows morros grows browse crows serows frowsy burros vrows prows brows drowsy cirrose charros karroos
farrow faro furrow furrowy far fro