Weapon of mass destruction and Weapons of mass destruction

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

Weapons of mass destruction and weapon of mass destruction are semantically related. In some cases you can replace phrase "Weapons of mass destruction" with "Weapon of mass destruction", this phrases are similar.

Weapon of mass destruction and weapons of mass destruction are semantically related. You can use "Weapon of mass destruction" instead a noun phrase "Weapons of mass destruction".