cryptolect vs idiomatic

cryptolect

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

idiomatic

noun
  • Synonym of idiom 

adj
  • Pertaining or conforming to idiom, the natural mode of expression of a language. 

  • Resembling or characteristic of an idiom. 

  • Relating to parts or pieces which are written both within the natural physical limitations of the instrument and human body and, less so or less often, the styles of playing used on specific instruments. 

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