trip wire vs war machine

trip wire and war machine both are nouns.

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

trip wire (noun)	war machine (noun)
a wire stretched close to the ground that activates something (a trap or camera or weapon) when tripped over	the military forces of a nation
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