noun
paper balloon
A small balloon made of paper, often used as a traditional Japanese toy or decoration.
子供の頃、紙風船でよく遊んだ。
When I was a child, I often played with paper balloons.
お祭りで紙風船を買った。
I bought a paper balloon at the festival.
Standard kanji spelling.
Mixed kanji-kana spelling, common in informal writing.
風船 is a general term for balloon, while 紙風船 specifically refers to a balloon made of paper.
Compound of 紙 (kami, 'paper') and 風船 (fūsen, 'balloon').