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.
repose repos reoppose repousse reps reaps repps repays repass rips raps rapes ripes ropes roups wraps ripsaw rupees rappees rupiahs
appose suppose repose pose oppose pappose depose reoppose pois pops pappoose posy pase hypos copse teapoys lipase epos poise capos tepoys hoopoos typos pows topos pappous posse papoose lupous pepos lapse coypous apos apse poos hippos popsie spouse repos hoopoes sepoys cheapos
repo rep reap repay repp arepa crepe crepey crepy preop prep prepay preppie preppy