acquittance vs free pass

acquittance

noun
  • The release from a debt, or from some obligation or duty; exemption. 

  • A writing which is evidence of a discharge; a receipt in full, which bars a further demand. 

free pass

noun
  • An exemption from normal processes. 

  • An intentional walk. 

  • A document entitling the bearer to free transportation. 

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