urban center vs Mazatlan

urban center and Mazatlan both are nouns.

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

urban center (noun)	Mazatlan (noun)
a large and densely populated urban area; may include several independent administrative districts	a port city in western Mexico on the Pacific Ocean; tourist center