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.
ceps cepes zeps seeps sepias sepoys sups saps zips sips zaps sops spas spice spues supes spies soaps soups spays spaes spews sipes space
beeps ceps cheeps wheeps weeps deeps zeps seeps reps veeps peps peeps neeps keps keeps jeeps yeps