incongruity vs inexistence

incongruity

noun
  • The state of being incongruous, or lacking congruence. 

  • A thing that is incongruous. 

  • An instance or point of disagreement 

inexistence

noun
  • The state of not being, not existing, or not being perceptible. 

  • The state of existing in something 

  • That which exists within; a constituent. 

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