Portuguese Republic vs European Union

Portuguese Republic and European Union both are nouns.

Word	Noun	Adjective	Verb	Adverb
Portuguese Republic	Yes	No	No	No
European Union	Yes	No	No	No

Portuguese Republic (noun)	European Union (noun)
a republic in southwestern Europe on the Iberian Peninsula; Portuguese explorers and colonists in the 15th and 16th centuries created a vast overseas empire (including Brazil)	an international organization of European countries formed after World War II to reduce trade barriers and increase cooperation among its members