Federative Republic of Brazil vs South American nation

Federative Republic of Brazil and South American nation both are nouns.

Word	Noun	Adjective	Verb	Adverb
Federative Republic of Brazil	Yes	No	No	No
South American nation	Yes	No	No	No

Federative Republic of Brazil (noun)	South American nation (noun)
the largest Latin American country and the largest Portuguese speaking country in the world; located in the central and northeastern part of South America; world's leading coffee exporter	any one of the countries occupying the South American continent