military machine vs war machine

military machine and war machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
military machine	Yes	No	No	No
war machine	Yes	No	No	No

As nouns, military machine and war machine are synonyms defined as:

Other synonyms of military machine include armed forces, armed services, military.

military machine (noun)	war machine (noun)
the military forces of a nation	the military forces of a nation