American vs Central America

American and Central America both are nouns.

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

American (noun)	Central America (noun)
the English language as used in the United States	the nations of Central America collectively
a native or inhabitant of the United States	the isthmus joining North America and South America; extends from the southern border of Mexico to the northern border of Colombia
a native or inhabitant of a North American or Central American or South American country

American (adjective)	Central 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