city vs Colon

city and Colon both are nouns.

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

city (noun)	Colon (noun)
people living in a large densely populated municipality	a port city at the Caribbean entrance to the Panama Canal
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter