exemption vs free speech

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 speech

noun
  • Expressions that are or should be allowed in some moral or legal context. 

  • The right to express an opinion in public without being restrained or censored. 

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