風船|ふうせんfuusen[0]heiban (flat)

1. nounballoon (toy or decoration)
   風船ふうせんが空そらに上あがっていった。↗

   The balloon went up in the sky.
2. nounballoon (hot-air or gas)orig. meaning

• SynonymバルーンNeutralKatakana loanword from English "balloon"; neutral in register, it is a close synonym of 風船 and can replace it in most contexts.

Use 風船 as the everyday word for balloons—party toys, decorations, and gas-filled types; バルーン is its neutral katakana loanword synonym, interchangeable in most contexts.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 息いきを吹き入ふきいれたりガスを注入ちゅうにゅうしたりして膨ふくらます、紙かみやゴムなどでできた袋ふくろ状じょうの玩具がんぐ。