institute vs weed out

institute

verb
  • To invest with the spiritual charge of a benefice, or the care of souls. 

  • To nominate; to appoint. 

  • To begin or initiate (something); to found. 

noun
  • An organization founded to promote a cause 

  • The person to whom an estate is first given by destination or limitation. 

  • An institution of learning; a college, especially for technical subjects 

  • The building housing such an institution 

weed out

verb
  • to remove unwanted elements from a group 

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