obstruction vs shutdown

obstruction

noun
  • Something which obstructs or impedes, either intentionally or unintentionally 

  • The act of obstructing, or state of being obstructed. 

  • The condition of having the natural powers obstructed in their usual course; the arrest of the vital functions; death. 

shutdown

noun
  • A statement, insult, etc. that prevents the opponent from replying further. 

  • The action of stopping operations; a closing, of a computer, business, event, etc. 

  • An autistic response to stress or sensory overload, in which the individual freezes up and becomes silent, motionless, and unresponsive. 

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