Aboriginal vs indigen

Aboriginal

noun
  • An Aboriginal inhabitant of Australia. 

adj
  • Of or pertaining to Australian Aboriginal peoples, Aborigines, or their language. 

name
  • Any of the native languages spoken by Australian aborigines. 

indigen

noun
  • An indigene or native. 

  • A plant known to be indigenous to a region, rather than a cultigen. 

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