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.
says sass seas saws soys saucy sassy sos sis syce sues sows sous sews sees cess seis suss sizy cissy saice sauce seise sissy souse sycee
ays bays shays ways says rays pays nays mays lays quays kays gays cays jays hays fays days chays yays as