Ellas vs Hellenic

Ellas and Hellenic both are nouns.

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

Ellas (noun)	Hellenic (noun)
a republic in southeastern Europe on the southern part of the Balkan peninsula; known for grapes and olives and olive oil	the Hellenic branch of the Indo-European family of languages

Ellas (adjective)	Hellenic (adjective)
	relating to or characteristic of the classical Greek civilization
	of or relating to or characteristic of Greece or the Greeks or the Greek language