metropolis vs Tammerfors

metropolis and Tammerfors both are nouns.

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

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