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.
pappus pappous paps pappose pappies pupus papas pappoose papaws poppies puppies pawpaws papoose pups peps pips pops pepos pipes poops popes popsy pupas peeps papacy poppas popsie
pappus quippus pus chuppas spues pupus pops pips paps opus nappes nappas lupus lupous quipus kappas cuppas koppas coypus peps coypous poppas hippos pups apps repps puss typps pappous shoppes
pappi pappy pap papa papaw pawpaw peppy poppa poppy puppy