national capital vs capital of Norway

national capital and capital of Norway both are nouns.

Word	Noun	Adjective	Verb	Adverb
national capital	Yes	No	No	No
capital of Norway	Yes	No	No	No

national capital (noun)	capital of Norway (noun)
the capital city of a nation	the capital and largest city of Norway; the country's main port; located at the head of a fjord on Norway's southern coast