Olympus vs Mount Olympus

Olympus and Mount Olympus both are nouns.

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

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

Olympus and Mount 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 Olympus include Mt. Olympus, Olimbos.

Olympus (noun)	Mount 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)