enfranchisement vs free speech

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 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 enfranchisement and free speech occurred in a corpus of books? (source: Google Ngram Viewer )