Chicago vs urban center

Chicago and urban center both are nouns.

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

Chicago (noun)	urban center (noun)
a gambling card game in which chips are placed on the ace and king and queen and jack of separate suits (taken from a separate deck); a player plays the lowest card of a suit in his hand and successively higher cards are played until the sequence stops; the player who plays a card matching one in the layout wins all the chips on that card	a large and densely populated urban area; may include several independent administrative districts
largest city in Illinois; a bustling Great Lakes port that extends 26 miles along the southwestern shoreline of Lake Michigan