Saint Elias Mountains vs range of mountains

Saint Elias Mountains and range of mountains both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Elias Mountains	Yes	No	No	No
range of mountains	Yes	No	No	No

Saint Elias Mountains (noun)	range of mountains (noun)
a range of mountains between Alaska and the Yukon territory	a series of hills or mountains