national capital vs capital of The Netherlands

national capital and capital of The Netherlands both are nouns.

Word	Noun	Adjective	Verb	Adverb
national capital	Yes	No	No	No
capital of The Netherlands	Yes	No	No	No

national capital (noun)	capital of The Netherlands (noun)
the capital city of a nation	an industrial center and the nominal capital of the Netherlands; center of the diamond-cutting industry; seat of an important stock exchange; known for its canals and art museum