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.
hippies hippos hips hopes hoopoes huppahs haps hops heaps hoops hoopoos
buppies guppies pappies chappies hippies nappies yuppies chippies puppies poppies koppies yippies pies copies spies cowpies weepies coppice rappees whoopies nappes kewpies tawpies popes shoppes pipes cheapies pes pis