firebomb vs bomb

firebomb and bomb both are nouns.

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

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

firebomb: a bomb that is designed to start fires; is most effective against flammable targets (such as fuel)
bomb: an explosive device fused to explode under specific conditions

As verbs, bomb is a hypernym of firebomb; that is, bomb is a word with a broader meaning than firebomb:

Other hypernyms of firebomb include bombard.

firebomb (noun)	bomb (noun)
a bomb that is designed to start fires; is most effective against flammable targets (such as fuel)	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

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