Den

A small cavern or hollow place in the side of a hill, or among rocks; esp., a cave used by a wild beast for shelter or concealment; as, a lion's den; a den of robbers.

A squalid place of resort; a wretched dwelling place; a haunt; as, a den of vice.

Any snug or close retreat where one goes to be alone.

A narrow glen; a ravine; a dell.

To live in, or as in, a den.

the habitation of wild animals

a room that is comfortable and secluded