exemption vs free pass

exemption

noun
  • An act of exempting. 

  • The state of being exempt; immunity. 

  • Freedom from a defect or weakness. 

  • A deduction from the normal amount of taxes. 

free pass

noun
  • An exemption from normal processes. 

  • An intentional walk. 

  • A document entitling the bearer to free transportation. 

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