Noun nighthawk has 2 senses
  1. night owl, nighthawk, nightbird - a person who likes to be active late at night
    --1 is a kind of individualist
  2. nighthawk, bullbat, mosquito hawk - mainly nocturnal North American goatsucker
    --2 is a kind of goatsucker, nightjar, caprimulgid
    --2 is a member of Chordeiles, genus Chordeiles
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