city vs Calgary

city and Calgary both are nouns.

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

city (noun)	Calgary (noun)
people living in a large densely populated municipality	the largest city in southern Alberta; an oil and gas center and a technology center for Alberta and most of western Canada
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter