urban center vs Fresno

urban center and Fresno both are nouns.

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

urban center (noun)	Fresno (noun)
a large and densely populated urban area; may include several independent administrative districts	a city in south central California in the San Joaquin Valley; center of an important agricultural area and gateway to the Sierra Nevada Mountains