avert vs instigate

avert

verb
  • To turn aside or away. 

  • To ward off, or prevent, the occurrence or effects of. 

instigate

verb
  • to goad or urge (a person) forward, especially to wicked actions; to provoke 

  • to incite; to bring about by urging or encouraging 

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