Xi'an vs urban center

Xi'an and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Xi'an	Yes	No	No	No
urban center	Yes	No	No	No

Xi'an (noun)	urban center (noun)
a city of central China; capital of ancient Chinese empire 221-206 BC	a large and densely populated urban area; may include several independent administrative districts