urban center vs Los Angeles

urban center and Los Angeles both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Los Angeles	Yes	No	No	No

urban center (noun)	Los Angeles (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in southern California; motion picture capital of the world; most populous city of California and second largest in the United States