Sapporo vs urban center

Sapporo and urban center both are nouns.

Word	Noun	Adjective	Verb	Adverb
Sapporo	Yes	No	No	No
urban center	Yes	No	No	No

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