Yokohama vs metropolis

Yokohama and metropolis both are nouns.

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

Yokohama (noun)	metropolis (noun)
port city on southeastern Honshu in central Japan	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts