Lockmaster and Trained worker

Lockmaster noun - A worker in charge of a lock (on a canal).

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

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

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