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 bituminous material, such as asphalt, used to pave roads.

v. To pave with a bituminous material.

n. a bituminous material used for providing a smooth paving to a road.

n. the surface of a road paved with blacktop{1}.

v. coat with blacktop

n. a black bituminous material used for paving roads or other areas; usually spread over crushed rock

"She said that blacktop is about 20 degrees warmer than regular pavement."

surface    coat    paving    paving material    pavement   

macadam    asphalt    cobblestone    Tarmac    unpaved