discoursing vs narration

discoursing

noun
  • conversation 

narration

noun
  • The act of recounting or relating in order the particulars of some action, occurrence, or affair; a narrating. 

  • That which is narrated or recounted; an orderly recital of the details and particulars of some transaction or event, or of a series of transactions or events; a story or narrative. 

  • That part of an oration in which the speaker makes his or her statement of facts. 

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