urban center vs Cancun

urban center and Cancun both are nouns.

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

urban center (noun)	Cancun (noun)
a large and densely populated urban area; may include several independent administrative districts	a popular island resort off the northeastern tip of the Yucatan peninsula