This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A small corner, alcove, or recess, especially one in a large room.

n. A hidden or secluded spot.

n. A small corner formed by two walls; an alcove or recess or ancone.

n. A hidden or secluded spot.

n. A narrow place formed by an angle in bodies or between bodies; a corner; a recess; a secluded retreat.

n. A corner.

n. A narrow place formed by an angle in bodies or between bodies; a recess; a secluded retreat.

To betake one's self to a recess or corner; ensconce one's self.

n. a sheltered and secluded place

n. an interior angle formed by two meeting walls

"The top of the nook is arched, and the back of the nook is curved."

retreat   

angle    inlet    nook of land   

every nook and cranny    any nook or cranny    nook or cranny    inglenook    nook and cranny   

corner    recess    nooklet    by-place   

Brook    Brooke    Chinook    Cook    Cooke    Crook    Hooke    Kirkuk    book    brook   

glade    alcove    recess    niche    cove    vale    grove    cave    crevice    bower