The Hague vs metropolis

The Hague and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
The Hague	Yes	No	No	No
metropolis	Yes	No	No	No

The Hague (noun)	metropolis (noun)
the site of the royal residence and the de facto capital in the western part of the Netherlands; seat of the International Court of Justice	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts