den

the place where an animal lives, especially a wild or dangerous animal such as a bear or lion

madriguera, guarida, nido (de animales)

Collocations den of lions

• The bear's den was high up in the mountains.

  La guarida del oso estaba en lo alto de las montañas.

a place where a group of people meet secretly, especially to plan something illegal or dangerous

cueva, guarida (de personas)

Collocations den of thieves

• The police raided the den where the gang was hiding.

  La policía irrumpió en la guarida donde estaba escondida la banda.

a room in a house or building, especially one that is used for a particular purpose

habitación, sala (para un propósito específico)

Collocations den of the living room

• The den was converted into a home office.

  La sala de estar se convirtió en un despacho en casa.