Plovdiv vs Philippopolis

Plovdiv and Philippopolis both are nouns.

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

As nouns, Plovdiv and Philippopolis are synonyms defined as:

Plovdiv and Philippopolis: an ancient city in southern Bulgaria; commercial center of an agricultural region

Plovdiv (noun)	Philippopolis (noun)
an ancient city in southern Bulgaria; commercial center of an agricultural region	an ancient city in southern Bulgaria; commercial center of an agricultural region