city vs Aarhus

city and Aarhus both are nouns.

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

city (noun)	Aarhus (noun)
people living in a large densely populated municipality	port city of Denmark in eastern Jutland
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter