Mt Etna vs Etna

Mt Etna and Etna both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mt Etna	Yes	No	No	No
Etna	Yes	No	No	No

As nouns, Mt Etna and Etna are synonyms defined as:

Mt Etna and Etna: an inactive volcano in Sicily; last erupted in 1961; the highest volcano in Europe (10,500 feet)

Other synonyms of Mt Etna include Mount Etna.

Mt Etna (noun)	Etna (noun)
an inactive volcano in Sicily; last erupted in 1961; the highest volcano in Europe (10,500 feet)	an inactive volcano in Sicily; last erupted in 1961; the highest volcano in Europe (10,500 feet)