trip wire vs armed services

trip wire and armed services both are nouns.

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

trip wire (noun)	armed services (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