This is the 4046th most frequent Japanese word.
バルーン
Balloon.
In this sentence, 'バルーン' refers to toy balloons being used for play.
子供たちはバルーンを膨らませて遊んでいます。
The children are inflating balloons and playing.
Here, 'バルーン' is used to describe the large envelope used in hot air balloons.
熱気球は巨大なバルーンを用いて空を飛びます。
Hot air balloons use massive balloons to fly in the sky.
In this context, 'バルーン' describes the shape of an object resembling a balloon as part of a sign.