concurrence vs diversity

concurrence

noun
  • An instance of simultaneous occurrence. 

  • Agreement; concurring. 

diversity

noun
  • Equal-opportunity inclusion. 

  • The quality of being diverse or different; difference or unlikeness. 

  • A variety; diverse types or examples. 

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