firebox vs gingernut

firebox

noun
  • A redheaded woman or her red pubic hair. 

  • The part of a fireplace where the fuel is burned. 

  • The chamber of a steam engine, or a steam locomotive, in which the fuel is burned. 

gingernut

noun
  • A redhead; a ginger-haired person. 

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

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