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.
foresaw fores foresee fours fries feres froes fares frees fires force forays furies ferries fairies faeries phoresy firs furs ferreous faros farce fairs froze fiars frays fears furze frows vires frass frise vireos varies frowzy ferias frisee fierce frieze fraise frowsy farcie freeze feuars farrows ferrous furioso furious furrows veeries
resaw foresaw resay resew resow presa daresay warsaw res