Lockkeeper and Trained worker

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

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

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

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