This is the 28th most frequent Portuguese word.
brasil
"Brasil" is the Portuguese word for "Brazil," a South American country.
Here, 'Brasil' is used as a noun to refer to the country of Brazil.
O Brasil é um país tropical.
Brazil is a tropical country.
In this sentence, 'Brasil' appears as the destination of a trip, used here as a proper noun in a directive context.
Eu fui ao Brasil nas minhas últimas férias.
I went to Brazil on my last vacation.
The proper noun 'Brasil' is used here in its adjectival form ('brasileira') to modify the noun 'cultura'.