city vs Luoyang

city and Luoyang both are nouns.

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

city (noun)	Luoyang (noun)
people living in a large densely populated municipality	a city in east central China; the capital of ancient China during several dynasties
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter