firebox vs redpoll

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. 

redpoll

noun
  • Any of various finches in the genus Acanthis (syn. Carduelis), which have characteristic red markings on their heads. 

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