Tartu vs urban center

Tartu and urban center both are nouns.

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

Tartu (noun)	urban center (noun)
a city of southeastern Estonia that was a member of the Hanseatic League	a large and densely populated urban area; may include several independent administrative districts