Sarajevo vs urban center

Sarajevo and urban center both are nouns.

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

Sarajevo (noun)	urban center (noun)
capital and largest city of Bosnia; scene of the assassination of Francis Ferdinand in 1914 which precipitated World War I	a large and densely populated urban area; may include several independent administrative districts