city vs Plovdiv

city and Plovdiv both are nouns.

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

city (noun)	Plovdiv (noun)
people living in a large densely populated municipality	an ancient city in southern Bulgaria; commercial center of an agricultural region
a large and densely populated urban area; may include several independent administrative districts
an incorporated administrative district established by state charter