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.
furze froze furzy freeze frieze furies furs friz froes fires fares frees fries feres fours fores farce frise frizz force frisee fraise farcie fierce frouzy frowzy frizzy feuars faeries fairies ferries foresaw foresee furioso furious furrows firs
furze craze source prize mures lures graze curse cures croze course raze furzy froze burse braze bourse aures nurse purse dures
fur four furrow furrowy furry fury