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Night owl

//ˈnaɪt aʊl// noun

Noun

1
An owl (order Strigiformes) that is nocturnal. literally
"Their Weapons like to Lightning, came and went: / Our Souldiers like the Night-Owles lazie flight, / Or like a lazie Threſher with a Flaile, / Fell gently downe, as if they ſtrucke their Friends."
2
a person who likes to be active late at night wordnet
3
One who goes to bed late, or stays up late at night or in the early hours of the morning. idiomatic
""You are one night owl, Monsieur Reetchie," he said. / "And you seem to prefer the small hours for your visits, Monsieur de St. Gré," I could not refrain from replying."
4
A musical instrument which imitates an owl's hoot, consisting of a receptacle partly filled with water and a mouthpiece that is blown into.
"The night-owl,—a mug-shaped instrument, with an orifice in its side, through which a whistle is inserted,—when used, is partly filled with water, to give the tremulous owl-hoot sound."

From night + owl, from the fact that the bird is active at night.

Unscramble this word: nightowl