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Night

Noun -  The time from sunset to sunrise.

Cap

Noun - A kind of soft, flat hat, sometimes with a visor.

Nightcap

Noun - An alcoholic or hot drink taken at the end of the day or before going to bed.

Can also describe a cap worn in bed, but no one really wears them any more.

Example Sentence:-

"We played a game of cards and then had a nightcap before we went to bed."