Hiroshima vs city

Hiroshima and city both are nouns.

Word	Noun	Adjective	Verb	Adverb
Hiroshima	Yes	No	No	No
city	Yes	No	No	No

Hiroshima (noun)	city (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	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts
	an incorporated administrative district established by state charter