causation vs instigation

causation

noun
  • The act of causing. 

  • The act or agency by which an effect is produced. 

  • Cause and effect, considered as a system. 

instigation

noun
  • The act of instigating, or the state of being instigated; incitement; especially to evil or wickedness. 

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