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.
pepos peps peeps pappose papoose pups pappous paps pips pops pappoose pipes pupas papas poops popes popsy pupus papaws pappus poppas popsie pappies pawpaws poppies puppies
epos repos pepos cheapos tepas topos zeps depose ceps sepoys repose reps veeps kepis poos weeps cheeps reoppose pops hypos neaps coypous leaps jeeps hoopoos hoopoes hippos heaps appose beeps pois keps lupous pows oppose pappose peeps pose posy reaps peps pappous capos neeps keeps apos repps cepes seeps suppose deeps teapoys tepoys typos wheeps cheaps yeps
pepo pep peep peppy epopee epopoeia