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.
quips quipus quippus cups kips coups coupes cuppas guppies caps cops gaps keps kops
quips ups rips cups nips pips lupus loups mips lips upas dipso ripes quipus dups supes tipis sips tipsy roups whaups whups chips yaups yips zips loupes pups dips coupes pipes pupas gips gipsy nipas jupes jaups coups dupes pupus taupes sups tips soups tups sipes hips kips whips wipes ships yipes yups
quip quippu quippy quipu equip