Wellington vs national capital

Wellington and national capital both are nouns.

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

Wellington (noun)	national capital (noun)
(19th century) a man's high tasseled boot	the capital city of a nation
the capital of New Zealand
British general and statesman; he defeated Napoleon at Waterloo; subsequently served as Prime Minister (1769-1852)