This is the 900th most frequent Polish word.
drużyn
The Polish word "drużyn" is the genitive plural form of "drużyna," meaning "teams" or "groups."
In this sentence, 'drużyn' is used in the genitive plural form to mean 'teams', showing association.
Mój brat jest fanem różnych drużyn piłkarskich.
My brother is a fan of various football teams.
The word 'drużynami' is in the instrumental plural form, indicating the entities involved in the action.
W szkole mamy konkurs wiedzy między drużynami.
In school, we have a knowledge contest between teams.
Here, 'drużyn' is in the genitive plural form, describing whose leaders are being referred to.