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.
feyly felly fly feel fuel feal fley fell filly folly vealy foley fella fully flooey fellah foully fellow felloe flu fil flea veil foul fail veal full file fila flee foal fool floe flue foil filo flew flow flay fall fill fowl flaw vela
feyly gayly shelly waylay doyly eely felly vealy jelly coyly belly mealy kelly nelly newly rely wryly seely delly telly welly shyly