Balkan Mountains vs Balkan Mountain Range

Balkan Mountains and Balkan Mountain Range both are nouns.

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

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

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

Other synonyms of Balkan Mountains include Balkans.

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