chief officer

chief mate

noun Nautical.
Also called chief officer.
Dictionary.com Unabridged

first mate

noun
the officer of a merchant vessel next in command beneath the captain.
Also called chief mate, chief officer, first officer, mate.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
first mate
 
n
Also called: first officer an officer second in command to the captain of a merchant ship

Collins English Dictionary - Complete & Unabridged 10th Edition
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