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.
papoose pappoose pappose paps pappous poops pepos papas popsie pappus papaws pappies pawpaws pips pops pups peps peeps pipes popes popsy pupas pupus papacy poppas poppies puppies
pappoose papoose poos pose poops suppose spouse repose reoppose hoopoos pappose oppose appose posse poohs poise depose