Kingston vs national capital

Kingston and national capital both are nouns.

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

Kingston (noun)	national capital (noun)
capital and largest city of Jamaica	the capital city of a nation
a town on the Hudson River in New York
a town in southeast Ontario on Lake Ontario near the head of the Saint Lawrence River