Los Angeles vs urban center

Los Angeles and urban center both are nouns.

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

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