declaration vs discourse

declaration

noun
  • A written or oral indication of a fact, opinion, intention, belief, etc. 

  • In common law, the formal document specifying plaintiff's cause of action, including the facts necessary to sustain a proper cause of action, and to advise the defendant of the grounds upon which he is being sued. 

  • The specification of an object, such as a variable or function, establishing its existence but not necessarily describing its contents. 

  • The act, by the captain of a batting side, of declaring an innings closed. 

  • The act or process of declaring. 

  • A list of items for various legal purposes, e.g. customs declaration. 

discourse

noun
  • Expression in words, either speech or writing. 

  • A formal lengthy exposition of some subject, either spoken or written. 

  • An institutionalized way of thinking, a social boundary defining what can be said about a specific topic (after Michel Foucault). 

  • Any rational expression, reason. 

verb
  • To exercise reason; to employ the mind in judging and inferring; to reason. 

  • To engage in discussion or conversation; to converse. 

  • To write or speak formally and at length. 

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