cruor vs rufous

cruor

noun
  • The colouring matter of the blood. 

  • The clotted portion of coagulated blood, containing the colouring matter; gore. 

rufous

noun
  • A reddish-brown colour, as of rust. 

adj
  • of a reddish colour 

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