Lisboa vs national capital

Lisboa and national capital both are nouns.

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

Lisboa (noun)	national capital (noun)
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	the capital city of a nation