IED vs gasoline bomb

IED and gasoline bomb both are nouns.

Word	Noun	Adjective	Verb	Adverb
IED	Yes	No	No	No
gasoline bomb	Yes	No	No	No

As nouns, gasoline bomb is a hyponym of IED; that is, gasoline bomb is a word with a more specific, narrower meaning than IED:

IED: an explosive device that is improvised
gasoline bomb: a crude incendiary bomb made of a bottle filled with flammable liquid and fitted with a rag wick

Other hyponyms of IED include Molotov cocktail, petrol bomb.

IED (noun)	gasoline bomb (noun)
an explosive device that is improvised	a crude incendiary bomb made of a bottle filled with flammable liquid and fitted with a rag wick