extirpate vs weed out

extirpate

verb
  • To surgically remove. 

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

  • To pull up by the roots; uproot. 

weed out

verb
  • to remove unwanted elements from a group 

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