Crewman and Trained worker

Crewman noun - Any member of a ship's crew.

Trained worker and crewman are semantically related. In some cases you can use "Trained worker" instead a noun "Crewman".

Trained worker noun - A worker who has acquired special skills.

Crewman and trained worker are semantically related. Sometimes you can replace term "Crewman" with "Trained worker", this terms are similar.