able seaman

noun
  1. 1

    A seaman, especially one in the merchant navy, who has been trained or certified in all routine duties; a member of the Royal Navy rated between ordinary seaman and leading seaman or boatswain's mate

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Source: https://en.wiktionary.org/wiki/able%20seaman, https://en.wiktionary.org/wiki/able-bodied%20seaman