In Portuguese, “but” is mas (pero in Spanish). In many parts of Brazil, mas sounds the same as mais, which means “more” (más in Spanish).
English: But there’s more!
Spanish: ¡Pero hay más!
Portuguese: Mas tem mais!
The word porém means the same as mas. You may hear the phrase, Mas tem um porém, which is Pero hay un pero in Spanish.
Sound Brazilian! Never use pero when speaking Portuguese! Remember the word mas.