Balkan nation vs Greece

Balkan nation and Greece both are nouns.

Word	Noun	Adjective	Verb	Adverb
Balkan nation	Yes	No	No	No
Greece	Yes	No	No	No

As nouns, Greece is a hyponym of Balkan nation; that is, Greece is a word with a more specific, narrower meaning than Balkan nation:

Balkan nation: any one of the countries on the Balkan Peninsula
Greece: ancient Greece; a country of city-states (especially Athens and Sparta) that reached its peak in the fifth century BCE

Balkan nation (noun)	Greece (noun)
any one of the countries on the Balkan Peninsula	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