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.
sees seesaw sews seis zees cees sues seas sycee seize seise sis sos says size suss soys sice sass cess sous syce saws sows cease cissy saice sassy sauce sissy souse
bees pees tees ghees vees gees jees cooees lees fees knees rees cees sees zees dees wees es