city vs Leon

city and Leon both are nouns.

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

city (noun)	Leon (noun)
people living in a large densely populated municipality	a city in central Mexico, in the state Guanajuato
a large and densely populated urban area; may include several independent administrative districts	a city in northwestern Spain at the foot of the Cantabrian Mountains
an incorporated administrative district established by state charter	a historical area and former kingdom in northwestern Spain