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