cryptozoic vs secretive

cryptozoic

adj
  • Relating to a cryptozoite. 

  • Living in a cavity or small cave. 

  • Hidden (especially in the soil); not easily visible. 

secretive

adj
  • Relating to secretion 

  • Having an inclination to secrecy 

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