declaration of war vs moratorium

declaration of war

noun
  • A formal announcement by a country or other body with military capability that it is in a state of war with another such entity. 

moratorium

noun
  • An authorization to a debtor, permitting temporary suspension of payments. 

  • A suspension of an ongoing activity. 

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