From The Collaborative International Dictionary of English v.0.48:

nighthawk \nighthawk\ n.
   1. A person who likes to be active late at night; a {night

   Syn: night owl, nightbird.
        [WordNet 1.5]

   2. (Zool.) Any of several mainly nocturnal North American
      goatsuckers, especially Chordeiles minor, or the related
      European goatsucker Caprimulgus europaeus, also called
      the nightjar.

   Syn: bullbat, mosquito hawk.
        [WordNet 1.5]
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