den

den /ˈdɛn/ noun
plural dens
den
/ˈdɛn/
noun
plural dens
Britannica Dictionary definition of DEN
[count]
1 
: the home of some kinds of wild animals
— see also lion's den
2 
a  US : an informal and comfortable room in a house
b  chiefly British, informal + old-fashioned : a small and quiet room in a house where someone goes to read, work, etc.
3 
: a secret place where people meet especially to do things that are illegal or immoral
4 
British : a small often secret structure that children play in
5 
US : a group of Cub Scouts — see also den mother