Omaha vs city

Omaha and city both are nouns.

Word	Noun	Adjective	Verb	Adverb
Omaha	Yes	No	No	No
city	Yes	No	No	No

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