city vs Omiya

city and Omiya both are nouns.

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

city (noun)	Omiya (noun)
people living in a large densely populated municipality	a city of east central Honshu; a suburb of Tokyo
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter