dampen vs instigate

dampen

verb
  • To become damped or deadened. 

  • To lessen; to dull; to make less intense (said of emotions and non-physical things). 

  • To become damp or moist. 

  • To make damp or moist; to make moderately wet. 

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 dampen and instigate occurred in a corpus of books? (source: Google Ngram Viewer )