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.
suss sous sass sues sassy sissy souse sis sos says sows cess seis saws sees sews soys seas cissy sauce saucy seise
buss fuss cuss gauss muss puss suss wuss us