is a specific kind of: skilled worker, skilled workman, trained worker.

is a broader term that covers: hand | lascar | gob, Jack, Jack-tar, mariner, old salt, sea dog, seafarer, seaman, tar | water dog, water rat | yachtsman, yachtswoman.

instances of which are: Alexander Selcraig, Alexander Selkirk, Selcraig, Selkirk.

derivation: sail.

is a specific kind of: skilled worker, skilled workman, trained worker.

is a broader term that covers: aircrewman | privateer, privateersman.

is a member of: crew.

is a specific kind of: employee.

is a member of: crew, gang, work party.