Sao Paulo vs Federative Republic of Brazil

Sao Paulo and Federative Republic of Brazil both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sao Paulo	Yes	No	No	No
Federative Republic of Brazil	Yes	No	No	No

Sao Paulo (noun)	Federative Republic of Brazil (noun)
an ultramodern city in southeastern Brazil; the largest city in South America	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