The difference between Barrage balloon and Hot-air balloon
When used as nouns, barrage balloon means a tethered balloon, attached to the ground with a metal cable, intended to deter low-flying enemy aircraft, whereas hot-air balloon means a balloon-shaped aircraft whose bag is inflated with hot air.
check bellow for the other definitions of Barrage balloon and Hot-air balloon
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Barrage balloon as a noun:
A tethered balloon, attached to the ground with a metal cable, intended to deter low-flying enemy aircraft; used especially in World War II.
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Hot-air balloon as a noun:
A balloon-shaped aircraft whose bag is inflated with hot air; it carries passengers and crew in a gondola slung underneath.