metropolis vs Kingston-upon Hull

metropolis and Kingston-upon Hull both are nouns.

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

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