San Bernardino vs urban center

San Bernardino and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
San Bernardino	Yes	No	No	No
urban center	Yes	No	No	No

San Bernardino (noun)	urban center (noun)
a city in southern California to the east of Los Angeles	a large and densely populated urban area; may include several independent administrative districts