cryptozoic vs nebulous

cryptozoic

adj
  • Relating to a cryptozoite. 

  • Living in a cavity or small cave. 

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

nebulous

adj
  • Relating to a nebula or nebulae. 

  • In the form of a cloud or haze; hazy. 

  • Vague or ill-defined. 

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