vacuum bomb vs bomb

vacuum bomb and bomb both are nouns.

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

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

Other hypernyms of vacuum bomb include FAE, fuel-air explosive.

vacuum bomb (noun)	bomb (noun)
a bomb that uses a fuel-air explosive	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

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