Is “Nightcap” a Scrabble word?

1.A warm cloth cap worn while sleeping, often with pajamas, being common attire in northern Europe before effective home heating became widespread.

“Winston wore a nightcap to stave off the cold.”

2.A beverage drunk before bed that is usually alcoholic.

“I'll make myself a nightcap of whisky and lemon before heading to bed.”

3.(by extension) Something the person reads or listens to before bed.