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.
friz frizz frizzy frieze frise fries furzy furze froze farci furies fraise frouzy frowzy frisee ferias farcie freeze ferries furious furioso fairies faeries furs firs fairs frees fores fours frass farcy fires fiars faros fears frays feres froes frows force farce fares