extirpate vs obliterate

extirpate

verb
  • To destroy completely; to annihilate, to cause to go extinct locally. 

  • To surgically remove. 

  • To pull up by the roots; uproot. 

obliterate

verb
  • To remove completely, leaving no trace; to wipe out; to destroy. 

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