Shellback and Water dog

Water dog and shellback are semantically related in sailor topic. In some cases you can use "Water dog" instead a noun "Shellback", when it comes to topics like person who travels by sea.

Water dog noun - A dog accustomed to water and usually trained to retrieve waterfowl.

Shellback and water dog are semantically related in sailor topic. You can use "Shellback" instead a noun phrase "Water dog", if it concerns topics such as person who travels by sea.