certainty vs mockery

certainty

noun
  • The state of being certain. 

  • A fact or truth unquestionably established. 

  • An instance of being certain. 

mockery

noun
  • The action of mocking; ridicule, derision. 

  • Mimicry, imitation, now usually in a derogatory sense; a travesty, a ridiculous simulacrum. 

  • Something so lacking in necessary qualities as to inspire ridicule; a laughing-stock. 

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