Mount Athos vs Athos

Mount Athos and Athos both are nouns.

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

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

Mount Athos and Athos: an autonomous area in northeastern Greece that is the site of several Greek Orthodox monasteries founded in the tenth century

Mount Athos (noun)	Athos (noun)
an autonomous area in northeastern Greece that is the site of several Greek Orthodox monasteries founded in the tenth century	an autonomous area in northeastern Greece that is the site of several Greek Orthodox monasteries founded in the tenth century