This is the 6458th most frequent Japanese word.
スポンジボール
"スポンジボール" (sponge ball) refers to a soft, lightweight ball made of sponge-like material.
Here, スポンジボール is used as a physical object, specifically a ball made of sponge, for playing.
子供たちはスポンジボールで楽しく遊んでいます。
The children are having fun playing with a sponge ball.
In this sentence, スポンジボール refers to the material type and its property, highlighting the suitability for indoor use due to its softness.
スポンジボールは柔らかいので室内で使用するのが安全です。
Since sponge balls are soft, it is safe to use them indoors.
スポンジボール here indicates the tool used for an activity, emphasizing its utility in creating patterns.