Mashhad vs metropolis

Mashhad and metropolis both are nouns.

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

Mashhad (noun)	metropolis (noun)
the holy city of Shiite Muslims; located in northeastern Iran	people living in a large densely populated municipality
	a large and densely populated urban area; may include several independent administrative districts