armed services vs trip wire

armed services and trip wire both are nouns.

Word	Noun	Adjective	Verb	Adverb
armed services	Yes	No	No	No
trip wire	Yes	No	No	No

armed services (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