Kirkuk vs metropolis

Kirkuk and metropolis both are nouns.

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

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