urban center vs Caloocan

urban center and Caloocan both are nouns.

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

urban center (noun)	Caloocan (noun)
a large and densely populated urban area; may include several independent administrative districts	a suburb of Manila in southwestern Luzon