Denali vs Mt. McKinley

Denali and Mt. McKinley both are nouns.

Word	Noun	Adjective	Verb	Adverb
Denali	Yes	No	No	No
Mt. McKinley	Yes	No	No	No

As nouns, Denali and Mt. McKinley are synonyms defined as:

Denali and Mt. McKinley: a mountain in south central Alaska; the highest peak in North America (20,300 feet high)

Other synonyms of Denali include McKinley, Mount McKinley.

Denali (noun)	Mt. McKinley (noun)
a mountain in south central Alaska; the highest peak in North America (20,300 feet high)	a mountain in south central Alaska; the highest peak in North America (20,300 feet high)