Vesuvius vs Mt. Vesuvius

Vesuvius and Mt. Vesuvius both are nouns.

Word	Noun	Adjective	Verb	Adverb
Vesuvius	Yes	No	No	No
Mt. Vesuvius	Yes	No	No	No

As nouns, Vesuvius and Mt. Vesuvius are synonyms defined as:

Vesuvius and Mt. Vesuvius: a volcano in southwestern Italy on the Mediterranean coast; a Plinian eruption in 79 AD buried Pompeii and killed Pliny the Elder; last erupted in 1944

Other synonyms of Vesuvius include Mount Vesuvius.

Vesuvius (noun)	Mt. Vesuvius (noun)
a volcano in southwestern Italy on the Mediterranean coast; a Plinian eruption in 79 AD buried Pompeii and killed Pliny the Elder; last erupted in 1944	a volcano in southwestern Italy on the Mediterranean coast; a Plinian eruption in 79 AD buried Pompeii and killed Pliny the Elder; last erupted in 1944