liberate vs untie

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. 

untie

verb
  • To free from fastening or from restraint; to let loose; to unbind. 

  • In the Perl programming language, to undo the process of tying, so that a variable uses default instead of custom functionality. 

  • To resolve; to unfold; to clear. 

  • To become untied or loosed. 

  • To loosen, as something interlaced or knotted; to disengage the parts of. 

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