mountain range vs chain of mountains

mountain range and chain of mountains both are nouns.

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

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

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

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