certainty vs conviction

certainty

noun
  • The state of being certain. 

  • A fact or truth unquestionably established. 

  • An instance of being certain. 

conviction

noun
  • The state of being wholly convinced. 

  • A judgement of guilt in a court of law. 

  • A firmly held belief. 

  • The state of being found or proved guilty. 

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