war machine vs drumbeat

war machine and drumbeat both are nouns.

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

war machine (noun)	drumbeat (noun)
the military forces of a nation	a vehement and vociferous advocacy of a cause
	(military) the beating of a drum as a signal for lowering the flag at sundown
	the sound made by beating a drum