national capital vs San Jose

national capital and San Jose both are nouns.

Word	Noun	Adjective	Verb	Adverb
national capital	Yes	No	No	No
San Jose	Yes	No	No	No

national capital (noun)	San Jose (noun)
the capital city of a nation	the capital and largest city of Costa Rica
	a city in western California located at the southern end of San Francisco Bay to the south of San Francisco; a center for computer and electronics industries