urban center vs Mashhad

urban center and Mashhad both are nouns.

Word	Noun	Adjective	Verb	Adverb
urban center	Yes	No	No	No
Mashhad	Yes	No	No	No

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