mistake vs scapegoat

mistake

verb
  • To understand wrongly, taking one thing or person for another. 

noun
  • An error; a blunder. 

  • A pitch which was intended to be pitched in a hard-to-hit location, but instead ends up in an easy-to-hit place. 

scapegoat

verb
  • To unfairly blame or punish someone for some failure; to make a scapegoat of. 

noun
  • Someone unfairly blamed or punished for some failure. 

  • In the Mosaic Day of Atonement ritual, a goat symbolically imbued with the sins of the people, and sent out alive into the wilderness while another was sacrificed. 

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