Europe vs Estonia

Europe and Estonia both are nouns.

Word	Noun	Adjective	Verb	Adverb
Europe	Yes	No	No	No
Estonia	Yes	No	No	No

Europe (noun)	Estonia (noun)
an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members	a republic in northeastern Europe on the Baltic Sea, with capital Tallinn
the nations of the European continent collectively
the 2nd smallest continent (actually a vast peninsula of Eurasia); the British use `Europe' to refer to all of the continent except the British Isles