Isfahan vs metropolis

Isfahan and metropolis both are nouns.

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

Isfahan (noun)	metropolis (noun)
city in central Iran; former capital of Persia	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts