nighthawk

1. (UK, regional)A nightjar, especially Caprimulgus europaeus (Eurasian nightjar).

2. (US)A New World nightjar of the genus Chordeiles, especially Chordeiles minor.

3. A person whose preference or custom is to remain awake and active during the night and the early morning hours.

   a person who likes to be active late at night

4. A nighthawker (metal detectorist who works illegally at night).

5. (Japan, historical)An unlicensed prostitute who worked the roadsides at night.

regular