Mt. McKinley vs Denali

Mt. McKinley and Denali both are nouns.

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

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

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

Other synonyms of Mt. McKinley include McKinley, Mount McKinley.

Mt. McKinley (noun)	Denali (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)