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.
whereases worses warsaws
creases whereases boreases ureases greases rases creeses harasses heiresses gyrases crases foresees fraises brasses cuirasses praises urases caresses pareses presses cereuses surcease diereses dresses hydrases trasses phoresies phereses duresses reuses cresses tresses braises arrases resews resees raises phrases hearses erases frasses heresies terrases wrasses grasses peeresses prases reraises seeresses diaereses diureses morasses charases