disagreement vs permission

disagreement

noun
  • A condition of not agreeing or concurring. 

  • An argument or debate. 

permission

noun
  • The act of permitting. 

  • authorisation; consent (especially formal consent from someone in authority) 

  • Flags or access control lists pertaining to a file that dictate who can access it, and how. 

verb
  • To grant or obtain authorization for. 

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