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.
hippos hips hippies hoopoes hoopoos huppahs haps hops heaps hoops hopes
hippos hypos nappas pois poos kappas posy pows pose pups repps poppas repos suppose peps teapoys paps topos pappous typps oppose chuppas quippus apos appose pips lupous coypous capos cuppas hoopoes epos hoopoos pops repose reoppose apps sepoys pepos depose pappus tepoys pappose typos nappes cheapos koppas shoppes
hippie hippo hippy hip happy hoppy huppah