calamity vs trauma centre

calamity

noun
  • The distress that results from some disaster. 

  • An event resulting in great loss. 

trauma centre

noun
  • A type of hospital with a highly capable trauma department. 

  • A specialized section of a hospital intended to treat suddenly occurring life-threatening injuries and medical conditions. 

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