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 waiting room or lounge for the use of performers when they are offstage, as in a theater or concert hall.

n. Alternative spelling of green room.

n. The retiring room of actors and actresses in a theater.

n. A room near the stage in a theater, to which actors retire during the intervals of their parts in the play.

n. A room in a warehouse where new or green cloth is received from the weaving factory.—

n. A room in a medical college where the faculty meet to hold examinations, etc.

n. An apartment for drying damp or ‘green’ pottery before it is burned.

n. a backstage room in a theater where performers rest or have visitors

"The function of poetry and the arts is to remind us that the greenroom is the greyest of illusions, and the reality is the drama presented before us, all its paint and tinsel, masks and pageantry, made one in art."

room   

antenuptial    lovers'    strangers'    pilot-house    give-and-take    'red'    rood-loft    amourist    nimble-witted    serving-boy