multifold vs polymorphous

multifold

adj
  • Many; very diverse; manifold. 

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 multifold and polymorphous occurred in a corpus of books? (source: Google Ngram Viewer )