Hiroshima vs urban center

Hiroshima and urban center both are nouns.

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

Hiroshima (noun)	urban center (noun)
a port city on the southwestern coast of Honshu in Japan; on August 6, 1945 Hiroshima was almost completely destroyed by the first atomic bomb dropped on a populated area	a large and densely populated urban area; may include several independent administrative districts