Yokohama vs urban center

Yokohama and urban center both are nouns.

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

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