Banff National Park vs metropolis

Banff National Park and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Banff National Park	Yes	No	No	No
metropolis	Yes	No	No	No

Banff National Park (noun)	metropolis (noun)
a popular vacation spot in the Canadian Rockies	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts