chimney vs den

chimney

noun
  • A narrow cleft in a rock face; a narrow vertical cave passage. 

  • A black eye; a shiner. 

  • The smokestack of a steam locomotive. 

  • The glass flue surrounding the flame of an oil lamp. 

  • A vagina. 

  • A vertical tube or hollow column used to emit environmentally polluting gaseous and solid matter (including but not limited to by-products of burning carbon- or hydrocarbon-based fuels); a flue. 

verb
  • To negotiate a chimney (narrow vertical cave passage) by pushing against the sides with back, feet, hands, etc. 

den

noun
  • A small cavern or hollow place in the side of a hill, or among rocks; especially, a cave used by a wild animal for shelter or concealment. 

  • Synonym of fort (“structure improvised from furniture, etc. for playing games.”) 

  • A comfortable room not used for formal entertaining. 

  • A group of Cub Scouts of the same age who work on projects together. 

  • A squalid or wretched place; a haunt. 

verb
  • To ensconce or hide oneself in (or as in) a den. 

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