armed forces vs court-martial

armed forces and court-martial both are nouns.

Word	Noun	Adjective	Verb	Adverb
armed forces	Yes	No	No	No
court-martial	Yes	No	Yes	No

armed forces (noun)	court-martial (noun)
the military forces of a nation	a trial that is conducted by a military court
	a military court to try members of the armed services who are accused of serious breaches of martial law

armed forces (verb)	court-martial (verb)
	subject to trial by court-martial