Sapporo vs metropolis

Sapporo and metropolis both are nouns.

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

Sapporo (noun)	metropolis (noun)
a commercial city in northern Japan on western Hokkaido	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts