bullfinch vs rufous

bullfinch

noun
  • The Eurasian bullfinch (Pyrrhula pyrrhula). 

  • Any of various other Old World finches in the genus Pyrrhula. 

rufous

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

adj
  • of a reddish colour 

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