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.
sass sassy seas suss says saws sissy zas sis sos seis sous sows cess sees soys sues sews cease cissy saice sauce saucy seise souse zoeas
ass bass quass lass mass pass sass tass as