South American nation vs South America

South American nation and South America both are nouns.

Word	Noun	Adjective	Verb	Adverb
South American nation	Yes	No	No	No
South America	Yes	No	No	No

South American nation (noun)	South America (noun)
any one of the countries occupying the South American continent	the nations of the South American continent collectively
	a continent in the western hemisphere connected to North America by the Isthmus of Panama