urban center vs Lanzhou

urban center and Lanzhou both are nouns.

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

urban center (noun)	Lanzhou (noun)
a large and densely populated urban area; may include several independent administrative districts	the capital city of the Chinese province of Gansu on the Yellow River