Krakau vs metropolis

Krakau and metropolis both are nouns.

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

Krakau (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