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.
repps reps reaps repos reoppose repass repays repose raps rappees rips repousse rapes ripes ropes roups wraps ripsaw rupees rupiahs
repps cuppas neeps paps epos veeps nappes hippos jeeps heaps cepes seeps deeps keeps typps reaps wheeps pops cheeps pips shoppes pepos beeps apps ceps neaps pappus leaps quippus nappas keps kepis koppas reps zeps kappas repos tepas pups weeps poppas cheaps peps chuppas peeps yeps
repp rep rappee reap repay repo arepa crepe crepey crepy prep prepay preppie preppy