Kingston upon Hull vs metropolis

Kingston upon Hull and metropolis both are nouns.

Word	Noun	Adjective	Verb	Adverb
Kingston upon Hull	Yes	No	No	No
metropolis	Yes	No	No	No

Kingston upon Hull (noun)	metropolis (noun)
a large fishing port in northeastern England	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts