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.
floor flour flora fluor floury florae foolery flir fleer filar flare filer valor flair flier fueler valour flurry fouler fleury foliar fowler feller feeler fuller faller filler velour failure filaree filaria fueller fullery filariae
floor fluor dolour sailor pillory glory couloir lory lour bailor flora flour lore valour valor velour jailor calory clour color colour galore pallor pylori dolor tailor
flooey flooie filo floe flow fool loophole