Omaha vs urban center

Omaha and urban center both are nouns.

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

Omaha (noun)	urban center (noun)
thoroughbred that won the triple crown in 1935	a large and densely populated urban area; may include several independent administrative districts
the Dhegiha dialect spoken by the Omaha
largest city in Nebraska; located in eastern Nebraska on the Missouri river; a major transportation center of the Midwest
a member of the Siouan people formerly living in the Missouri river valley in northeastern Nebraska