liberate vs obviate

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. 

obviate

verb
  • To avoid (a future problem or difficult situation). 

  • To anticipate and prevent or bypass (something which would otherwise have been necessary or required). 

noun
  • Synonym of obviative 

adj
  • Synonym of obviative 

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