This is the 3010th most frequent Portuguese word.
uruguai
Uruguai: Uruguay, a country in South America.
Here, 'Uruguai' is used as a proper noun referring to the country Uruguay in South America.
Eu moro no Uruguai.
I live in Uruguay.
In this context, 'Uruguai' is part of a possessive construction indicating the origin of the wine.
O vinho do Uruguai é excelente.
The wine from Uruguay is excellent.
Again, 'Uruguai' serves as a proper noun to denote the country.