American vs South America

American and South America both are nouns.

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

American (noun)	South America (noun)
the English language as used in the United States	the nations of the South American continent collectively
a native or inhabitant of the United States	a continent in the western hemisphere connected to North America by the Isthmus of Panama
a native or inhabitant of a North American or Central American or South American country

American (adjective)	South America (adjective)
of or relating to or characteristic of the continents and islands of the Americas
of or relating to the United States of America or its people or language or culture