This is the 8387th most frequent Polish word.
piłka
Ball.
In this sentence, 'piłkę' refers to the ball used in the context of playing sports.
Mój brat gra w piłkę na boisku.
My brother plays ball on the field.
Here, 'piłkę' signifies a specific type of ball, tailored for basketball.
Chciałbym kupić nową piłkę do koszykówki.
I would like to buy a new basketball.
In this example, 'piłka' simply denotes a ball in terms of an object without implying any specific activity.