I.E.D. vs explosive device

I.E.D. and explosive device both are nouns.

Word	Noun	Adjective	Verb	Adverb
I.E.D.	Yes	No	No	No
explosive device	Yes	No	No	No

As nouns, explosive device is a hypernym of I.E.D.; that is, explosive device is a word with a broader meaning than I.E.D.:

I.E.D.: an explosive device that is improvised
explosive device: device that bursts with sudden violence from internal energy

I.E.D. (noun)	explosive device (noun)
an explosive device that is improvised	device that bursts with sudden violence from internal energy