armed forces vs war machine

armed forces and war machine both are nouns.

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

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

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

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