obstruct vs shut out

obstruct

verb
  • To get in the way of so as to hide from sight. 

  • To impede, retard, or interfere with; hinder. 

  • To block or fill (a passage) with obstacles or an obstacle. See synonyms at block. 

shut out

verb
  • To hide from sight. 

  • To prevent from scoring; to perform a shutout. 

  • To refuse to be open and vulnerable toward. 

  • To prevent from entering; to block or exclude. 

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