Appalachian Mountains vs range of mountains

Appalachian Mountains and range of mountains both are nouns.

Word	Noun	Adjective	Verb	Adverb
Appalachian Mountains	Yes	No	No	No
range of mountains	Yes	No	No	No

Appalachian Mountains (noun)	range of mountains (noun)
a mountain range in the eastern United States extending from Quebec to the Gulf of Mexico; a historic barrier to early westward expansion of the United States	a series of hills or mountains