discourse vs imagery

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. 

imagery

noun
  • Rhetorical decoration in writing or speaking; vivid descriptions presenting or suggesting images of sensible objects; figures in discourse. 

  • Imitation work. 

  • Images in general, or en masse. 

  • Unreal show; imitation; appearance. 

  • The work of the imagination or fancy; false ideas; imaginary phantasms. 

  • The work of one who makes images or visible representation of objects. 

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