metropolis vs Kirkuk

metropolis and Kirkuk both are nouns.

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

metropolis (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