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.
guipures cupreous koupreys quippers gapers cuppers cuprous gawpers kippers capers copers copras
guipures purs preys pries purees puris purrs purse oppress prese repress cypress spares spores sprues suppress press pursy pares koupreys pours pores peres pyres vapours presa apres prees repours cypres sapours spires sprees spurs depress