Balkan Mountain Range vs Balkan Mountains

Balkan Mountain Range and Balkan Mountains both are nouns.

Word	Noun	Adjective	Verb	Adverb
Balkan Mountain Range	Yes	No	No	No
Balkan Mountains	Yes	No	No	No

As nouns, Balkan Mountain Range and Balkan Mountains are synonyms defined as:

Balkan Mountain Range and Balkan Mountains: the major mountain range of Bulgaria and the Balkan Peninsula

Other synonyms of Balkan Mountain Range include Balkans.

Balkan Mountain Range (noun)	Balkan Mountains (noun)
the major mountain range of Bulgaria and the Balkan Peninsula	the major mountain range of Bulgaria and the Balkan Peninsula