city vs Odessa

city and Odessa both are nouns.

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

city (noun)	Odessa (noun)
people living in a large densely populated municipality	a port city of south central Ukraine on an arm of the Black Sea
a large and densely populated urban area; may include several independent administrative districts	a city in western Texas
an incorporated administrative district established by state charter