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