earplug vs pierce

earplug

noun
  • A piece of protective gear meant to be inserted in the ear canal to protect the wearer's hearing from loud noises or the intrusion of water. 

verb
  • To fit with earplugs. 

pierce

noun
  • A pierced earring. 

verb
  • 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 break or interrupt abruptly 

  • To puncture; to break through. 

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