marine vs United States of America

marine and United States of America both are nouns.

Word	Noun	Adjective	Verb	Adverb
marine	Yes	Yes	No	No
United States of America	Yes	No	No	No

marine (noun)	United States of America (noun)
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

marine (adjective)	United States of America (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