nighthawk

Etymology

From night + hawk.

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. 1929, Ernest Hemingway, A Farewell to Arms, Folio Society, published 2008, page 91
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).