U.S. vs marine

U.S. and marine both are nouns.

Word	Noun	Adjective	Verb	Adverb
U.S.	Yes	No	No	No
marine	Yes	Yes	No	No

U.S. (noun)	marine (noun)
the executive and legislative and judicial branches of the federal government of the United States	a soldier who serves both on shipboard and on land
North American republic containing 50 states - 48 conterminous states in North America plus Alaska in northwest North America and the Hawaiian Islands in the Pacific Ocean; achieved independence in 1776

U.S. (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