aboriginal vs autochthonous

aboriginal

adj
  • First according to historical or scientific records; original; indigenous; primitive. 

  • Living in a land before colonization by the Europeans. 

noun
  • An animal or plant native to a region. 

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. 

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