metropolis vs Caloocan

metropolis and Caloocan both are nouns.

Word	Noun	Adjective	Verb	Adverb
metropolis	Yes	No	No	No
Caloocan	Yes	No	No	No

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