discursory vs polemical

discursory

adj
  • argumentative; discursive; reasoning 

polemical

adj
  • Being an attempt to evaluate the arguments comprehensively. 

  • Prone to causing disputes; inclined to causing the expression of opposing opinions, disputatious, contentious, edgy. 

noun
  • A diatribe or polemic. 

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