Santa Ana vs urban center

Santa Ana and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Santa Ana	Yes	No	No	No
urban center	Yes	No	No	No

Santa Ana (noun)	urban center (noun)
a city in southern California to the east of Long Beach	a large and densely populated urban area; may include several independent administrative districts
a city in western El Salvador
Mexican general who tried to crush the Texas revolt and who lost battles to Winfield Scott and Zachary Taylor in the Mexican War (1795-1876)
a strong hot dry wind that blows in winter from the deserts of southern California toward the Pacific Coast