Merchant marine and Water dog

Merchant marine noun - Conveyance provided by the ships belonging to one country or industry.

Water dog and merchant marine are semantically related. In some cases you can use "Water dog" instead a noun phrase "Merchant marine".

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

Merchant marine and water dog are semantically related. Sometimes you can use "Merchant marine" instead a noun phrase "Water dog".