Explosive device and Improvised explosive device

Explosive device noun - Device that bursts with sudden violence from internal energy.

Improvised explosive device and explosive device are semantically related. In some cases you can replace phrase "Improvised explosive device" with "Explosive device", this phrases are similar.

Improvised explosive device noun - An explosive device that is improvised.

Explosive device and improvised explosive device are semantically related. You can use "Explosive device" instead a noun phrase "Improvised explosive device".