This is the 304th most frequent Hebrew word.
כדור
Ball; pill; sphere.
In this sentence, 'כדור' is used to mean 'ball', representing a round object used in sports or play.
הילד בעט בכדור בעוצמה.
The child kicked the ball with strength.
Here, 'כדור' refers to a 'pill', a small round object used as medication.
הרופא נתן לי כדור לשיכוך כאבים.
The doctor gave me a pill for pain relief.
In this context, 'כדור' is part of the term 'כדור הארץ' (the Earth), indicating a spherical celestial body.