Coast Range vs Coast Mountains

Coast Range and Coast Mountains both are nouns.

Word	Noun	Adjective	Verb	Adverb
Coast Range	Yes	No	No	No
Coast Mountains	Yes	No	No	No

As nouns, Coast Range and Coast Mountains are synonyms defined as:

Coast Range and Coast Mountains: a string of mountain ranges along the Pacific coast of North America from southeastern Alaska to Lower California

Coast Range (noun)	Coast Mountains (noun)
a string of mountain ranges along the Pacific coast of North America from southeastern Alaska to Lower California	a string of mountain ranges along the Pacific coast of North America from southeastern Alaska to Lower California