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.
befleas beefless beefaloes baffles befalls befools befouls beefalos boffolas bevels biofuels buffalos biophilias
befleas fleas defleas cuffless flies riffles refiles piffles mayflies files flees floes flews fleys dayflies flaws waffles shooflies flays flues roofless ruffles reflies duffles sawflies baffles defiles souffles rifles raffles whiffles beefless muffles leafless coffles hoofless boffolas shuffles