national capital vs capital of Georgia

national capital and capital of Georgia both are nouns.

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

national capital (noun)	capital of Georgia (noun)
the capital city of a nation	the capital and largest city of Georgia on the Kura river
	state capital and largest city of Georgia; chief commercial center of the southeastern United States; was plundered and burned by Sherman's army during the American Civil War