peacekeeping mission vs military machine

peacekeeping mission and military machine both are nouns.

Word	Noun	Adjective	Verb	Adverb
peacekeeping mission	Yes	No	No	No
military machine	Yes	No	No	No

peacekeeping mission (noun)	military machine (noun)
the activity of keeping the peace by military forces (especially when international military forces enforce a truce between hostile groups or nations)	the military forces of a nation