Liepaja vs urban center

Liepaja and urban center both are nouns.

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

Liepaja (noun)	urban center (noun)
a city of southwestern Latvia on the Baltic Sea	a large and densely populated urban area; may include several independent administrative districts