oh perhaps you meant the difference between poke & nudge or elbow ... poke , it means to push something quickly using your fingers ... however , nudge means to push someone gently but it's usually by using your elbow ... so elbow ,
The actions are the same -- a short, sharp thrust of a minor nature- but pricking generally requires a sharp instrument while poking generally requires a blunter one.
I pricked my finger with a needle. I poked myself in the eye with my finger.