city vs Billings

city and Billings both are nouns.

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

city (noun)	Billings (noun)
people living in a large densely populated municipality	the largest city in Montana; located in southern Montana on the Yellowstone river
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter