This is the 402nd most frequent Portuguese word.
grupo
A collection of people, things, or entities considered together as a unit.
Here, 'grupo' is used to refer to a collection of individuals forming a band or musical ensemble.
O grupo musical se apresentou no teatro ontem.
The musical group performed at the theater yesterday.
In this sentence, 'grupo' refers to a collection of people gathered for the specific purpose of studying.
O estudante se juntou ao grupo de estudos para preparar-se para o exame.
The student joined the study group to prepare for the exam.
In this context, 'grupo' is used for a collection of items, specifically artworks, that share a common feature.