discontinuation vs shutdown

discontinuation

noun
  • The act of stopping producing or supplying a product. 

  • The process of quitting a course of treatment with a drug. 

shutdown

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

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

  • 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 discontinuation and shutdown occurred in a corpus of books? (source: Google Ngram Viewer )