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.
cepes ceps zeps spues supes spews spaes sipes seeps spies sepias sepoys speise speiss saps sips sops spas sups zaps zips
cepes pes kepis rupees coupes pipes napes apes neeps epos jupes cowpies pepos copes veeps japes keps ceps kewpies loupes buppies guppies nappies sipes rapes heaps hoopoes poppies yippies wheeps yeps shapes toupees cheeps cheapies spues chapes whoopies spews zeps dopes weepies epees topees reaps tawpies tepas veepees tapes ripes repps leaps pappies hopes seeps nappes cowpeas ropes gapes mopes beeps peps jeeps puppies lopes repos keeps copies hypes capes koppies opes peas neaps pies popes hippies peeps pews supes pehs dupes rappees teepees taupes peso tepees reps types deeps spaes pees whoopees wipes spies chappies cheaps topes chippies shoppes weeps yipes yuppies