Mount Olympus vs Mt. Olympus

Mount Olympus and Mt. Olympus both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mount Olympus	Yes	No	No	No
Mt. Olympus	Yes	No	No	No

As nouns, Mount Olympus and Mt. Olympus are synonyms defined as:

Mount Olympus and Mt. Olympus: a mountain peak in northeast Greece near the Aegean coast; believed by ancient Greeks to be the dwelling place of the gods (9,570 feet high)

Other synonyms of Mount Olympus include Olimbos, Olympus.

Mount Olympus (noun)	Mt. Olympus (noun)
a mountain peak in northeast Greece near the Aegean coast; believed by ancient Greeks to be the dwelling place of the gods (9,570 feet high)	a mountain peak in northeast Greece near the Aegean coast; believed by ancient Greeks to be the dwelling place of the gods (9,570 feet high)