balloon bomb vs bomb

balloon bomb and bomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
balloon bomb	Yes	No	No	No
bomb	Yes	No	Yes	No

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

balloon bomb (noun)	bomb (noun)
a bomb carried by a balloon	an explosive device fused to explode under specific conditions
	strong sealed vessel for measuring heat of combustion
	an event that fails badly or is totally ineffectual

balloon bomb (verb)	bomb (verb)
	throw bombs at or attack with bombs
	fail to get a passing grade