Tammerfors vs metropolis

Tammerfors and metropolis both are nouns.

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

Tammerfors (noun)	metropolis (noun)
an industrial city in south central Finland	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts