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.
repass repays reps reaps repos repps repousse repose rupiahs raps rips reoppose rapes ripes ropes roups wraps ripsaw rupees rappees
bypass pass repass pas piss peas pays paws passe pase paps napas koppas lipase papas pias sepias spas dopas tepas chuppahs kapas nipas kappas puss nappas copays opahs cowpeas papaws cuppas pupas capias huppahs pawpaws poppas repays spaes spays tapas upas chuppas
repay rep reap repo repp arepa crepe crepey crepy prep prepay preppie preppy