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