Hellenic Republic vs Ellas

Hellenic Republic and Ellas both are nouns.

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

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

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

Other synonyms of Hellenic Republic include Greece.

Hellenic Republic (noun)	Ellas (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