Ferrara vs metropolis

Ferrara and metropolis both are nouns.

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

Ferrara (noun)	metropolis (noun)
a city in northern Italy	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts