Nuclear weapon and Weapon of mass destruction

Nuclear weapon noun - A weapon of mass destruction whose explosive power derives from a nuclear reaction.

Weapon of mass destruction and nuclear weapon are semantically related. in atomic weapon topic. In some cases you can use "Weapon of mass destruction" instead a noun phrase "Nuclear weapon".

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

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