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.
furrows farrows frows frowsy furs furioso ferrous furious ferreous vrows fours froes faros feuars vrouws frowzy furies ferries firs fiars frass furzy feres fries froze fears frays frise furze fairs fares frees fires fores pharos frouzy fraise ferias vireos forays frisee faeries fairies foresaw foresee gharris
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
furrow furrowy farrow furry fro fur