This is the 2384th most frequent Turkish word.
grupları
"Grupları" means "their groups" or "groups of" in English, depending on the context.
Here, 'grupları' is used in possessive form to indicate ownership or presence of groups within a specified place (school).
Okulda çeşitli grupları var.
There are various groups at school.
In this case, 'grupları' is used to signify groups associated with a specific set of people ('their groups'), highlighting possession.
Onlar birkaç gruplarıyla çalışıyorlar.
They are working with a few of their groups.
Here, 'grupları' serves to denote 'different groups' as direct objects in the context of the teams representing certain entities.