Balloon
noun
A wind boat. This is a strange one for sure. You may assume this is like one of those giant balloons you can go ride around in, and you'd be partly right. Really, this word covers the general word balloon, though it especially has to do with the toy-style balloons (or smaller balloons). It's a little round wind ship!
ふうせん
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
あのピエロが、風船で犬を作ってくれたんだ。
That clown made a dog out of a balloon for me.
ひ行きによったば合は、この風船をエチケットぶくろの代わりにごしようください。
Please use this balloon as a motion sickness bag when you feel air sick.
風船を使って実際に空飛ぶ家を作った人たちがいます。
Some people actually made a house float using balloons.