incendiary bomb vs firebomb

incendiary bomb and firebomb both are nouns.

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

As nouns, incendiary bomb and firebomb are synonyms defined as:

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

Other synonyms of incendiary bomb include incendiary.

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

incendiary bomb (verb)	firebomb (verb)
	attack with incendiary bombs