autochthonous vs immigrant

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. 

immigrant

noun
  • A plant or animal that establishes itself in an area where it previously did not exist. 

  • A non-native person who comes to a country from another country to permanently settle there. 

adj
  • Of or relating to immigrants or the act of immigrating. 

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