national capital vs Lisboa

national capital and Lisboa both are nouns.

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

national capital (noun)	Lisboa (noun)
the capital city of a nation	capital and largest city and economic and cultural center of Portugal; a major port in western Portugal on Tagus River where it broadens and empties into the Atlantic