Salzburg vs metropolis

Salzburg and metropolis both are nouns.

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

Salzburg (noun)	metropolis (noun)
city in western Austria; a music center and birthplace of Mozart	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts