Ocean vs Oceanographical - What's the difference?

As a noun ocean

is one of the five large bodies of water separating the continents.

is {{given name|female|from=English}} of modern usage.

of or pertaining to oceanography, the science of oceans.

(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 oceanography, the science of oceans.

* oceanographic

* oceanographically