St. Elias Mountains vs chain of mountains

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

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

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