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

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n. The trade of hanging wallpaper on walls

n. The application of wallpaper to walls for decorative purposes.

n. The operation of fixing wall-papers or paper-hangings to walls.

n. plural Paper, either plain or variously ornamented, used for covering and adorning the walls of rooms, etc.: so called because they form a substitute for the earlier hangings of cloth or tapestry.

n. the application of wallpaper

"He was intimate with all the paperhanging in the house; saw things that no one else saw in the patterns; found out miniature tigers and lions running up the bedroom walls, and squinting faces leering in the squares and diamonds of the floor – cloth."

coating    application    covering   

papering