Hellenistic Greek vs Katharevousa

Hellenistic Greek

name
  • Synonym of Koine (the Greek language from the time of Alexander the Great) 

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 Greek and Katharevousa occurred in a corpus of books? (source: Google Ngram Viewer )