urban center vs Augusta

urban center and Augusta both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Augusta	Yes	No	No	No

urban center (noun)	Augusta (noun)
a large and densely populated urban area; may include several independent administrative districts	the capital of the state of Maine
	a city in eastern Georgia north-northwest of Savannah; noted for golf tournaments