capital of Cuba vs national capital

capital of Cuba and national capital both are nouns.

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

capital of Cuba (noun)	national capital (noun)
the capital and largest city of Cuba; located in western Cuba; one of the oldest cities in the Americas	the capital city of a nation