OCEAN

- Old French occean, from Latin oceanus, + Greek ōkeanos, = great river/ sea surrounding the disk of

      the Earth* {root/ meaning unknown} [Possibly Pre-Greek, from personified Oceanus - Titan ocean god,

      a primeval parent of the Olympian gods of Greek mythology; son of Uranus (sky god) & Gaia (earth

      goddess,) and father of the river gods, (the Oceanids.)]

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      The vast body of salt water covering 70% of the globe. Technically there's only 1 Ocean, but it's sub-

divided into 5 oceans:  Pacific 🔍,  Atlantic 🔍,  Indian,  Antarctic 🔍 (or Southern🔍) &  Arctic 🔍.

      (Though occasionally applied to smaller bodies, such as the German Ocean, the modern North Sea.)

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SEA 

- Old English sæ = sheet of water, sea, lake, pool  from Proto-Germanic saiwa {unknown origin} once a

reference to any great mass or large quantity; originally it covered all manner of bodies of water from

marshes to rivers, and even today it has no sharp distinction from either lake or ocean (above.) It's now

used for marginal, 2nd- order sections of ocean + large bodies of salt water, wholly or nearly landlocked.**

  [Synonym for Ocean, as THE  Sea - paradoxically, SEA is a broader term than OCEAN i.e. the

Ocean is a specific part of greater Sea, but the Seas include more than just the Ocean.]​

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* As opposed to the other significant Greek body of water; the Mediterranean Sea🔍.  The only known land masses of.

the time were Eurasia & Africa and the OCEAN was thought of as an endless RIVER that flowed around them

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  ** 2 exceptions: Sea of Galilee is fresh water & Sargasso Sea within the North Atlantic Gyre, (a circular ocean current)

has no coast