metis vs mixed

metis

adj
  • Of mixed heritage 

  • Of Métis heritage. 

noun
  • A person of mixed-race ancestry. 

  • A person of one-eighth black ancestry; an octoroon. 

  • Practical intelligence; street smarts. 

mixed

adj
  • Stemming from two or more races or breeds 

  • Including both male(s) and female(s). 

  • Not completely pure, tainted or adulterated. 

  • Having two or more separate aspects. 

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