city vs Kirkuk

city and Kirkuk both are nouns.

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

city (noun)	Kirkuk (noun)
people living in a large densely populated municipality	a city in northeastern Iraq; the center of a rich oilfield with pipelines to the Mediterranean
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter