optimism vs terrorism

optimism

noun
  • the doctrine that this world is the best of all possible worlds 

  • a tendency to expect the best, or at least, a favourable outcome 

  • the belief that good will eventually triumph over evil 

terrorism

noun
  • The system of fear and intimidation put into place during the Reign of Terror in Revolutionary France around 1793-94. 

  • The use of unlawful violence against people or property to achieve political objectives. 

  • The use of intimidation or bullying tactics. 

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