range of mountains vs St. Elias Mountains

range of mountains and St. Elias Mountains both are nouns.

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

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