den vs where

den

noun
  • A squalid or wretched place; a haunt. 

  • 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 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. 

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

where

noun
  • The place in which something happens. 

adv
  • In, at or to which. 

  • The place in, at or to which. 

  • What place. 

  • Interrogative adverb, used in either a direct or indirect question: in, at or to what place. 

  • where are. 

  • In what situation. 

conj
  • In, at or to the place (that) or a place (that). 

  • In a position, case, etc. in which; if. 

  • In, at or to which place or situation. 

  • While on the contrary; although; whereas. 

  • In, at or to any place (that); wherever; anywhere. 

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