enfranchise vs enslave

enfranchise

verb
  • To grant the privilege of voting to a person or group of people. 

  • to convert a copyhold estate into a freehold estate 

  • To grant freedom from slavery, duty or servitude. 

  • To grant municipal or parliamentary rights to an entity such as a city or constituency. 

enslave

verb
  • To make subservient; to strip one of freedom; enthrall. 

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