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.
pawpaws papaws papas paps papacy pappus pappose pappous papoose pappies pips peps pups pops pappoose peeps pepos pipes poops popes popsy pupas pupus poppas popsie poppies puppies
pawpaws paws cowpeas papaws pas