national capital vs Czech capital

national capital and Czech capital both are nouns.

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

national capital (noun)	Czech capital (noun)
the capital city of a nation	the capital and largest city of the Czech Republic in the western part of the country; a cultural and commercial center since the 14th century