Saint Elias Mountains vs St. Elias Mountains

Saint Elias Mountains and St. Elias Mountains both are nouns.

Word	Noun	Adjective	Verb	Adverb
Saint Elias Mountains	Yes	No	No	No
St. Elias Mountains	Yes	No	No	No

As nouns, Saint Elias Mountains and St. Elias Mountains are synonyms defined as:

Saint Elias Mountains and St. Elias Mountains: a range of mountains between Alaska and the Yukon territory

Other synonyms of Saint Elias Mountains include St. Elias Range.

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