cryptolect vs demotic

cryptolect

noun
  • A secretive language form used by a subculture; an arcane cant. 

demotic

noun
  • Language as spoken or written by the common people. 

adj
  • Of, relating to, or written in the ancient Egyptian script that developed from Lower Egyptian hieratic writing starting from around 650 BCE and was chiefly used to write the Demotic phase of the Egyptian language, with simplified and cursive characters that no longer corresponded directly to their hieroglyphic precursors. 

  • Of or for the common people. 

  • Of, relating to, or written in the form of modern vernacular Greek. 

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