urban center vs Tijuana

urban center and Tijuana both are nouns.

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

urban center (noun)	Tijuana (noun)
a large and densely populated urban area; may include several independent administrative districts	a Mexican city just to the south of San Diego on the Lower California peninsula; popular among American tourists for racetracks and bullfights