den vs saddlebag

den

noun
  • A comfortable room not used for formal entertaining. 

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

  • 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. 

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

saddlebag

noun
  • A style of house with two rooms separated by a small hall and open space. 

  • A covered pouch, usually one of a pair, laid across the back of a horse, donkey, or mule behind its saddle, or hanging over the rear wheel of a bicycle or motorcycle; often made of leather or (on a bicycle or motorcycle) a rigid material. 

  • Loose fatty flesh on a person's upper thighs or buttocks, that hangs like saddlebags. 

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