chain of mountains vs mountain range

chain of mountains and mountain range both are nouns.

Word	Noun	Adjective	Verb	Adverb
chain of mountains	Yes	No	No	No
mountain range	Yes	No	No	No

As nouns, chain of mountains and mountain range are synonyms defined as:

Other synonyms of chain of mountains include chain, mountain chain, range, range of mountains.

chain of mountains (noun)	mountain range (noun)
a series of hills or mountains	a series of hills or mountains