boatswain

Short definition from Wiktionary

Noun

1. 1
   The officer (or warrant officer) in charge of sails, rigging, anchors, cables etc. and all work on deck of a sailing ship.
2. 2
   The petty officer of a merchant ship who controls the work of other seamen.
3. 3
   A kind of gull, the jaeger.
4. 4
   The tropicbird.