Noun spearfish has 2 senses
  1. spearfish - any of several large vigorous pelagic fishes resembling sailfishes but with first dorsal fin much reduced; worldwide but rare
    --1 is a kind of
    billfish
    --1 is a member of Tetrapturus, genus Tetrapturus
  2. marlin, spearfish - large long-jawed oceanic sport fishes; related to sailfishes and spearfishes; not completely cold-blooded i.e. able to warm their brains and eyes
    --2 is a kind of billfish
    --2 is a member of Makaira, genus Makaira
    --2 has particulars:
     blue marlin, Makaira nigricans; black marlin, Makaira mazara; black marlin, Makaira marlina; striped marlin, Makaira mitsukurii; white marlin, Makaira albida
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