sea/ocean

According to Oxford Dictionary you are correct.
Certain names are the same for both Americans and British.
The Baltic Sea and the Atlantic Ocean

Thanks, Saab.

That's not accurate and there is a difference in meaning between an ocean and a sea. An analogy to land would make oceans continents and seas countries. Seas are smaller bodies of water.

Most people are taught that there are 4 oceans but this model has recently been extended to a 5 ocean model. Within the oceans are seas, and as an example the Indian Ocean contains the Andaman Sea, Arabian Sea, Bay of Bengal, Gulf of Aden, Mozambique Channel, Persian Gulf, Red Sea and the Timor Sea.

There is a difference in the meaning regarding the size - Americans go swimming either in the Atlantic Ocean or the Pacific Ocean. The British in the North Sea or the Irish Sea or the English Channel, but that is another story. So it is logical that they use different words.

British and Americans use both "sea" and "ocean".

an example might be :

"a seafaring nation" but "an ocean bound vessel" .
hbg