cryptozoic vs stealthy

cryptozoic

adj
  • Relating to a cryptozoite. 

  • Living in a cavity or small cave. 

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

stealthy

adj
  • Characterized by or resembling stealth or secrecy. 

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