Strassburg vs urban center

Strassburg and urban center both are nouns.

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

Strassburg (noun)	urban center (noun)
city on the Rhine in eastern France near the German border; an inland port	a large and densely populated urban area; may include several independent administrative districts