discourse vs primer

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. 

primer

noun
  • An introductory text on any subject, particularly basic concepts. 

  • A layer of such a substance. 

  • A prayer or devotional book intended for laity, initially an abridgment of the breviary and manual including the hours of the Virgin Mary, 15 gradual and 7 penitential psalms, the litany, the placebo and dirige forming the office of the dead, and the commendations. 

  • Any of various similar works issued in England for private prayer in accordance with the Book of Common Prayer. 

  • An elementary school class; an elementary school student. (No longer used.) 

  • A molecule which initiates the synthesis of an enzyme, (especially) a single-stranded nucleic acid molecule which initiates DNA replication. 

  • A pheromone which interacts first with the endocrine system. 

  • Any substance or device, such as priming wire or blasting cap, used to ignite gunpowder or other explosive. 

  • A children's book intended to teach literacy: how to read, write, and spell. 

  • A layer of makeup that goes beneath the foundation; undermakeup. 

  • A substance used to prime wood, metal, etc. in preparation for painting. 

  • A device used to prime an internal combustion engine with gasoline, (especially) in airplanes. 

  • A person who prunes trees. 

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