effacement vs zapping

effacement

noun
  • The act of expunging, of wiping out; expungement. 

  • A shortening, or thinning, of the cervix before or during early labour. 

  • Withdrawal in order to make oneself inconspicuous; the making of oneself inconspicuous. 

zapping

noun
  • The act or result of being zapped. 

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