armed forces vs military machine

armed forces and military machine both are nouns.

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

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

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

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