Trondheim vs metropolis

Trondheim and metropolis both are nouns.

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

Trondheim (noun)	metropolis (noun)
a port in central Norway on Trondheim Fjord	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts