Alcove

Definition:

(n.) A recessed portion of a room, or a small room opening into a larger one; especially, a recess to contain a bed; a lateral recess in a library.
(n.) A small ornamental building with seats, or an arched seat, in a pleasure ground; a garden bower.
(n.) Any natural recess analogous to an alcove or recess in an apartment.

Compare alcove with other words:

alcove vs. bedroom