basin vs den

basin

verb
  • To shelter or enclose in a basin. 

  • To serve as or become a basin. 

  • To create a concavity or depression in. 

noun
  • A rock formation scooped out by water erosion. 

  • An area of land from which water drains into a common outlet; drainage basin. 

  • A wide bowl for washing, sometimes affixed to a wall. 

  • A depression, natural or artificial, containing water. 

den

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

noun
  • 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. 

  • A squalid or wretched place; a haunt. 

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