detach vs liberate

detach

verb
  • To take apart from; to take off. 

  • To separate for a special object or use. 

  • To come off something. 

liberate

verb
  • To release from restraint or inhibition. 

  • To release from chemical bonds or solutions. 

  • To acquire from an enemy during wartime, used especially of cities, regions, and other population centers. 

  • To release from servitude or unjust rule. 

  • To release from slavery: to manumit. 

  • To acquire from another by theft or force: to steal, to rob. 

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