Nautical and Saltwater

Nautical adjective - Of or relating to navigation of the sea.

Saltwater and nautical are semantically related in seagoing topic. In some cases you can use "Saltwater" instead an adjective "Nautical".

Saltwater noun - Water containing salts.

Nautical and saltwater are semantically related in sea topic. You can use "Nautical" instead an adjective "Saltwater", if it concerns topics such as marine, seagoing, concerning the sea.