Ocean vs Bathypelagic - What's the difference?

As a noun ocean

is ocean.

of or pertaining to the parts of the oceans at depths between 1000 and 4000 meters deep.

(en noun)

(countable) One of the five large bodies of water separating the continents.

(uncountable) Water belonging to an ocean.

The island is surrounded by ocean

(figuratively) An immense expanse; any vast space or quantity without apparent limits.

the boundless ocean of eternity

an ocean of affairs

* (large body of water) the ogin (qualifier)

* a drop in the ocean * Oceania * oceanic * oceanography * ocean tramp * Oceanus

(-)

Of or pertaining to the parts of the oceans at depths between 1000 and 4000 meters deep.