pierce vs unstop

pierce

verb
  • to break or interrupt abruptly 

  • To penetrate; to affect deeply. 

  • To get to the heart or crux of (a matter). 

  • To create a hole in the skin for the purpose of inserting jewelry. 

  • To puncture; to break through. 

noun
  • A pierced earring. 

unstop

verb
  • To remove a stoppage; to clear a blockage. 

  • To draw out the stops of (an organ). 

  • To unplug or uncork a container. 

How often have the words pierce and unstop occurred in a corpus of books? (source: Google Ngram Viewer )