This is the 3771st most frequent Portuguese word.
bayer
The word "bayer" is not a standard Portuguese word; it may refer to the pharmaceutical company Bayer or be a misspelling.
Here, 'Bayer' is used as a proper noun referring to the pharmaceutical company.
Eu comprei aspirina fabricada pela Bayer.
I bought aspirin manufactured by Bayer.
Here, 'Bayer' is used to denote the company focusing on its actions or fields of operation.
Bayer investe em pesquisa no setor químico.
Bayer invests in research in the chemical sector.
In this case, 'Bayer' again refers to a brand, specifically products related to agriculture.