chain of mountains vs St. Elias Mountains

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

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

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