Small, hidden corners or spaces in a room or other place.
Nooks are usually cozy and private places.
Examples:
She likes to read in the nook by the window.
The cat found a nook under the bed to hide in.
I found a nook in the garden to sit and think.
The mouse made a cozy home in the nook of the wall.
The tree had a secret nook where the fairies lived.
I found a nook in the library where I could read in peace.