Ellas vs Hellenic Republic

Ellas and Hellenic Republic both are nouns.

Word	Noun	Adjective	Verb	Adverb
Ellas	Yes	No	No	No
Hellenic Republic	Yes	No	No	No

As nouns, Ellas and Hellenic Republic are synonyms defined as:

Ellas and Hellenic Republic: 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 Greece.

Ellas (noun)	Hellenic Republic (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