Weapon of mass destruction and Weapon system

Weapon of mass destruction noun - A weapon that kills or injures civilian as well as military personnel (nuclear and chemical and biological weapons).

Weapon system and weapon of mass destruction are semantically related. In some cases you can use "Weapon system" instead a noun phrase "Weapon of mass destruction".

Weapon system noun - Any instrument or instrumentality used in fighting or hunting.

Weapon of mass destruction and weapon system are semantically related. Sometimes you can replace phrase "Weapon of mass destruction" with "Weapon system", this phrases are similar.