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.
coping cooping copping couping capping cupping gaping gapping gawping keeping kepping kipping quipping
ping whapping repping reaping leaping oping hooping roping cupping jauping rapping pupping dipping pooping taping coping sapping lopping gipping looping aping toping ripping dapping sipping cheeping bopping chopping wiping mapping whipping souping yapping yawping gypping peeping couping japing keeping pepping quipping whopping topping duping siping soaping shipping wapping typing supping nipping popping hopping seeping capping moping napping gaping hoping lapping hyping louping piping zipping tapping doping wheeping hipping copping gapping knapping loping gawping kipping kepping rouping heaping jeeping pipping chipping lipping zapping upping weeping shopping sopping wrapping dupping tupping whupping riping tipping shaping beeping mopping raping fopping yipping yauping happing whooping cooping chapping spang peeing pieing piing pang pingo spaeing hypoing pink spuing pong pung pooing