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.
seeps sepoys sepias ceps saps zeps sips sops spas sups cepes soaps spaes sipes spays spues spews soups spies supes specie speiss hyssops seapiece spaz zaps zips
beeps peeps deeps veeps cheeps seeps keeps jeeps neeps wheeps weeps reps whoopees topees repos repps pees epees peps cepes heaps keps epos reaps pepos rappees toupees rupees neaps tepas teepees zeps veepees tepees kepis leaps ceps cheaps yeps