Blue Ridge Mountains vs Blue Ridge

Blue Ridge Mountains and Blue Ridge both are nouns.

Word	Noun	Adjective	Verb	Adverb
Blue Ridge Mountains	Yes	No	No	No
Blue Ridge	Yes	No	No	No

As nouns, Blue Ridge Mountains and Blue Ridge are synonyms defined as:

Blue Ridge Mountains and Blue Ridge: a range of the Appalachians extending from southern Pennsylvania to northern Georgia

Blue Ridge Mountains (noun)	Blue Ridge (noun)
a range of the Appalachians extending from southern Pennsylvania to northern Georgia	a range of the Appalachians extending from southern Pennsylvania to northern Georgia