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.
fleecy fleece fleys flees foleys fallacy flews false feels fleas flues flies flays floes files filles falsie floozy flossy folles floosy filose failles feeless fellies felloes fillies floosie floozie flossie foliose follies valleys volleys
flee feel file flea flew fley floe flue foley level levelly