Hellenistic Koine vs Katharevousa

Hellenistic Koine

name
  • Synonym of Koine (the Greek dialect of Hellenistic times) 

Katharevousa

name
  • Coordinate terms: Classical Greek, Demotic Greek, Ancient Greek, Koine, purist Greek 

  • A learned, archaising form of Modern Greek, based on Classical Greek and used for formal and official purposes; it was legally displaced as the official language of Greece in 1976 by Demotic Greek. 

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