sea vs marine

sea and marine both are nouns.

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

sea (noun)	marine (noun)
a division of an ocean or a large body of salt water partially enclosed by land	a soldier who serves both on shipboard and on land
turbulent water with swells of considerable size
anything apparently limitless in quantity or volume

sea (adjective)	marine (adjective)
	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