den
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.
A comfortable room not used for formal entertaining.
Structure improvised from furniture, etc. for playing games.
(UK, Scotland, obsolete) A narrow glen; a ravine; a dell.
A group of Cub Scouts of the same age who work on projects together.
To ensconce or hide oneself in (or as in) a den.
(zoology) Of an animal, to use as a den; to take up residence in.