city vs Caloocan

city and Caloocan both are nouns.

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

city (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
an incorporated administrative district established by state charter