war machine vs armed forces

war machine and armed forces both are nouns.

Word	Noun	Adjective	Verb	Adverb
war machine	Yes	No	No	No
armed forces	Yes	No	No	No

As nouns, war machine and armed forces are synonyms defined as:

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

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