debatable vs discursory

debatable

adj

  • Able to be debated; up for discussion. 

  • Open to debate; not fully proved or confirmed. 

noun

  • A topic that is open to debate. 

discursory

adj

  • argumentative; discursive; reasoning 

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