Littoral and Oceangoing

Littoral adjective - Of, relating to, or situated in the waters near the shore.

Oceangoing and littoral are semantically related in marine topic. In some cases you can use "Oceangoing" instead an adjective "Littoral", when it comes to topics like concerning the sea.

Oceangoing adjective - Used on the high seas.

Littoral and oceangoing are semantically related in sea topic. Sometimes you can use "Littoral" instead an adjective "Oceangoing", if it concerns topics such as marine, concerning the sea.