Krakow vs metropolis

Krakow and metropolis both are nouns.

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

Krakow (noun)	metropolis (noun)
an industrial city in southern Poland on the Vistula	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts