The difference between Barrage balloon and Tethered aerostat
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 tethered aerostat means an aerostat, such as a balloon, connected to the ground by a cable and winch, and used as an observation platform etc.
check bellow for the other definitions of Barrage balloon and Tethered aerostat
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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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Tethered aerostat as a noun:
an aerostat, such as a balloon, connected to the ground by a cable and winch, and used as an observation platform etc.