discourse vs rationalization

discourse

noun
  • Any rational expression, reason. 

  • 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). 

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. 

rationalization

noun
  • The process or result of rationalizing. 

  • The concealment of true motivation in some non-threatening way. 

  • The simplification of an expression without changing its value. 

  • A reorganization of a company or organization in order to improve its efficiency. 

  • A statement of one's motives, or of the causes of some event. 

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