war machine vs trip wire

war machine and trip wire both are nouns.

Word	Noun	Adjective	Verb	Adverb
war machine	Yes	No	No	No
trip wire	Yes	No	No	No

war machine (noun)	trip wire (noun)
the military forces of a nation	a wire stretched close to the ground that activates something (a trap or camera or weapon) when tripped over
	a small military force that serves as a first line of defense; if they become engaged in hostilities it will trigger the intervention of stronger military forces