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 window set vertically into a small gable projecting from a sloping roof.

n. The gable holding such a window.

n. a room-like, roofed projection from a sloping roof

n. dormer-window

n. A window pierced in a roof, and so set as to be vertical while the roof slopes away from it. Also, the gablet, or houselike structure, in which it is contained.

n. A sleeping-room; a dormitory.

n. A dormer-window.

n. Same as dormant

n. a gabled extension built out from a sloping roof to accommodate a vertical window

"I used to pretend I was a lighthouse keeper and the dormer was my lighthouse, and I’d look out for boats about to crash on our ront lawn, which I pretended was a treacherous beach."

dormer window   

window   

former    informer    performer    reformer    stormer    transformer    warmer   

glassless    unpartitioned    driver's-side    roundheaded    leaded-glass    west-facing    bottle glass    uncurtained    arrow-slit    diamond-paned