gingernut vs rufous

gingernut

noun
  • A redhead; a ginger-haired person. 

  • A hard biscuit, flavoured with powdered ginger, often dunked in tea. 

rufous

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

adj
  • of a reddish colour 

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