Ellas vs Greece

Ellas and Greece both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ellas	Yes	No	No	No
Greece	Yes	No	No	No

As nouns, Ellas and Greece are synonyms defined as:

Ellas and Greece: a republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil

Other synonyms of Ellas include Hellenic Republic.

Ellas (noun)	Greece (noun)
a republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil	a republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil
	ancient Greece; a country of city-states (especially Athens and Sparta) that reached its peak in the fifth century BCE