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.
tipis tips topis tapis tipsy tawpies tups dips taps tops tapes typos tepas tapas dipso topos topes types typps taupes topees tepoys tepees teapoys teepees toupees diapause toepiece daps dups
tipis pis lapis pias koppies quipus pies piso kewpies pois sepias buppies lips nappies sips ripes zips pipes dipso nips tawpies tips topis whips wipes cheapies chips yipes yips poppies piss kips dips quips guppies cowpies kepis capias gipsy rips copies hips sipes puppies pips pappies spies nipas tapis mips gips hippies tipsy weepies whoopies chappies chippies ships yippies yuppies