nighthawk

noun

1. (UK, regional)A nightjar, especially Caprimulgus europaeus (Eurasian nightjar).
2. (US)A New World nightjar of the genus Chordeiles, especially Chordeiles minor.

   “The swallows circled around and I watched them and the night-hawks flying above the roofs and drank the Cinzano.”

3. A person whose preference or custom is to remain awake and active during the night and the early morning hours.
4. A nighthawker (metal detectorist who works illegally at night).
5. (Japan, historical)An unlicensed prostitute who worked the roadsides at night.