enfranchisement vs liberation

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 

liberation

noun
  • The act of liberating or the state of being liberated. 

  • The achievement of equal rights and status. 

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