involve vs liberate

involve

verb
  • To envelop, enfold, entangle. 

  • To take in; to gather in; to mingle, blend or merge. 

  • To cause or engage (someone or something) to participate or to become connected or implicated. 

  • To comprise or include; to have as a related part. 

  • To complicate or make intricate. 

liberate

verb
  • 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 release from restraint or inhibition. 

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

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