This is the 2216th most frequent Russian word.
девочек
The genitive plural form of "девочка," meaning "girls."
The word 'девочек' is in the genitive case, indicating 'for the girls' as the indirect object.
Я купил подарки для девочек.
I bought gifts for the girls.
The word 'девочек' is in the genitive plural after a numeral ('three').
В комнате сидят три девочек.
Three girls are sitting in the room.
The word 'девочек' is in the prepositional case, used to show the meeting with the girls.