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.
pappous pappus pappose pappoose paps papoose pappies pupus papas pepos papaws puppies poppies pawpaws pips pops pups peps pipes poops popes popsy pupas peeps papacy poppas popsie
pappous pappose spouse reoppose pupus pepos pappus oppose pious lupous quippus coypous copious hippos appose suppose pus