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.
repos repose reps reaps repps reoppose repousse repays repass rips raps rapes ripes ropes roups wraps ripsaw rupees rappees rupiahs
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
repo rep reap repay repp arepa crepe crepey crepy preop prep prepay preppie preppy