actuality vs certainty

actuality

noun
  • An instance or quality of being actual or factual; fact. 

  • Live reporting on current affairs. 

  • The state of existing; existence. 

  • A short early motion picture. 

certainty

noun
  • A fact or truth unquestionably established. 

  • The state of being certain. 

  • An instance of being certain. 

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