convention vs discourse

convention

noun
  • The convening of a formal meeting. 

  • A formal agreement, contract, rule, or pact. 

  • A treaty or supplement to such. 

  • A meeting or gathering. 

  • A practice or procedure widely observed in a group, especially to facilitate social interaction; a custom. 

  • A formal deliberative assembly of mandated delegates. 

discourse

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

  • Expression in words, either speech or writing. 

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