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.
flour floury fluor flora floor fouler fleury velour florae valour flurry flir failure filer flair filar fleer valor flare flier fuller faller fowler fueler foliar feller filler valuer feeler velure filaree filaria foolery fueller fullery filariae
flour dolour lour valour velour clour colour bluer bailor loury valor floor allure gluer velure jailor lore blur lure couloir tailleur floury sailor pillory pallor valuer galore fluor calory pylori color glory dolor failure slur lory colure flora soilure tailor
flu filo floe flooey flooie flow flue foul foully afoul