discourse vs preamble

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. 

preamble

noun
  • A short preliminary statement or remark, especially an explanatory introduction to a formal document or statute. 

  • A syncword. 

verb
  • To speak or write a preamble; to provide a preliminary statement or set of remarks. 

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