weapon of mass destruction vs war machine

weapon of mass destruction and war machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
weapon of mass destruction	Yes	No	No	No
war machine	Yes	No	No	No

weapon of mass destruction (noun)	war machine (noun)
a weapon that kills or injures civilian as well as military personnel (nuclear and chemical and biological weapons)	the military forces of a nation