multiform vs protean

multiform

adj
  • Having more than one shape or appearance. 

noun
  • An organism, folktale, etc. that appears in more than one form. 

protean

adj
  • Exceedingly variable; readily assuming different shapes or forms. 

noun
  • A protein that has been slightly modified by water, dilute acid, or enzymes, but not modified to the extent of a metaprotein. 

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