concurrence vs congruity

concurrence

noun
  • Agreement; concurring. 

  • An instance of simultaneous occurrence. 

congruity

noun
  • The quality of agreeing; the quality of being suitable and appropriate. 

  • An instance or point of agreement or correspondence; a resemblance. 

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