national capital vs Santiago

national capital and Santiago both are nouns.

Word	Noun	Adjective	Verb	Adverb
national capital	Yes	No	No	No
Santiago	Yes	No	No	No

national capital (noun)	Santiago (noun)
the capital city of a nation	a naval battle in the Spanish-American War (1898); the United States fleet bottled up the Spanish ships in the harbor of Santiago de Cuba and destroyed them when they tried to escape
	the capital and largest city of Chile; located in central Chile; one of the largest cities in South America
	a port city in southeastern Cuba; industrial center
	city in the northern Dominican Republic
	largest of the Cape Verde Islands in the Atlantic Ocean