oceangoing vs marine

oceangoing is not a noun while marine is a noun.

Word	Noun	Adjective	Verb	Adverb
oceangoing	No	Yes	No	No
marine	Yes	Yes	No	No

oceangoing (noun)	marine (noun)
	a soldier who serves both on shipboard and on land

oceangoing (adjective)	marine (adjective)
used on the high seas	relating to or characteristic of or occurring on or in the sea
	of or relating to the sea
	of or relating to military personnel who serve both on land and at sea (specifically the U.S. Marine Corps)
	relating to or involving ships or shipping or navigation or seamen
	native to or inhabiting the sea