This is the 5753rd most frequent Portuguese word.
apiacás
"Apiacás" refers to a municipality in the state of Mato Grosso, Brazil.
In this sentence, 'Apiacás' is used as a proper noun, referring to the name of an indigenous community.
Os Apiacás são um grupo indígena do Brasil.
The Apiacás are an indigenous group from Brazil.
Here, 'Apiacás' refers to a specific geographical location, the name of a town.
Eu visitei Apiacás, uma cidade bonita no Mato Grosso.
I visited Apiacás, a beautiful town in Mato Grosso.
In this usage, 'Apiacás' is part of a proper noun, 'rio Apiacás', referring to a natural feature, a river.