autochthonous vs tribal

autochthonous

adj
  • Native to the place where found; indigenous. 

  • Originating where found; found where it originates. 

  • Buried in place, especially of a fossil preserved in its life position without disturbance or disarticulation. 

tribal

adj
  • Of or relating to tribes. 

  • Based on or organized according to tribes. 

noun
  • A member of a tribe. 

  • A design or image that has been influenced by indigenous peoples; especially such a tattoo. 

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