detour vs discursion

detour

noun
  • A diversion or deviation from one's original route. 

  • The diversion of the flow of execution for debugging or similar purposes. 

verb
  • To make a detour. 

  • To direct or send on a detour. 

discursion

noun
  • Digression. 

  • Ratiocination; step-by-step philosophical reasoning, as opposed to intuition. 

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