Jersey City vs metropolis

Jersey City and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jersey City	Yes	No	No	No
metropolis	Yes	No	No	No

Jersey City (noun)	metropolis (noun)
a city in northeastern New Jersey (opposite Manhattan)	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts