mixed vs polymorphous

mixed

adj
  • Having two or more separate aspects. 

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

  • Not completely pure, tainted or adulterated. 

  • Stemming from two or more races or breeds 

polymorphous

adj
  • Having, or occurring in, several distinct forms 

  • Crystallizing in two or more different forms; polymorphic 

  • Having, or assuming, a variety of forms, characters, or styles 

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