This is the 8368th most frequent Portuguese word.
ushuaia
"Ushuaia" is not a Portuguese word; it is the name of a city in Argentina, known as the southernmost city in the world.
Ushuaia is being used as a proper noun to refer to the city in southern Argentina.
Eu gostaria de visitar Ushuaia algum dia.
I would like to visit Ushuaia someday.
Ushuaia is used in the nominative form as the subject of the sentence, referring to the city.
Ushuaia é conhecida como a cidade do fim do mundo.
Ushuaia is known as the city at the end of the world.
Ushuaia is used as a locative reference indicating the specific place described in the sentence.