comment vs discourse

comment

verb
  • To make remarks or notes. 

  • To insert comments into (source code). 

  • To comment out (code); to disable by converting into a comment. 

  • To remark. 

noun
  • A remark embedded in source code in such a way that it will be ignored by the compiler or interpreter, typically to help people to understand the code. 

  • The part of a sentence that provides new information regarding the current theme. 

  • The act of commenting. 

  • A spoken or written remark. 

discourse

verb
  • To write or speak formally and at length. 

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

  • To engage in discussion or conversation; to converse. 

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. 

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