barrage balloon vs airship

barrage balloon and airship both are nouns.

Word	Noun	Adjective	Verb	Adverb
barrage balloon	Yes	No	No	No
airship	Yes	No	No	No

As nouns, airship is a hypernym of barrage balloon; that is, airship is a word with a broader meaning than barrage balloon:

barrage balloon: an elongated tethered balloon or blimp with cables or net suspended from it to deter enemy planes that are flying low
airship: a steerable self-propelled aircraft

Other hypernyms of barrage balloon include dirigible.

barrage balloon (noun)	airship (noun)
an elongated tethered balloon or blimp with cables or net suspended from it to deter enemy planes that are flying low	a steerable self-propelled aircraft