war machine vs peacekeeper

war machine and peacekeeper both are nouns.

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

war machine (noun)	peacekeeper (noun)
the military forces of a nation	the pistol of a law officer in the old West
	someone who keeps peace
	a member of a military force that is assigned (often with international sanction) to preserve peace in a trouble area