Samarcand vs urban center

Samarcand and urban center both are nouns.

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

Samarcand (noun)	urban center (noun)
city in southern Uzbekistan; Tamerlane's opulent capital in the 14th century	a large and densely populated urban area; may include several independent administrative districts