enfranchisement vs free pass

enfranchisement

noun
  • The act of enfranchising 

  • The investiture with any of several municipal privileges 

  • the conversion of a copyhold estate into a freehold estate 

  • A release from slavery 

free pass

noun
  • An intentional walk. 

  • An exemption from normal processes. 

  • A document entitling the bearer to free transportation. 

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