armed forces vs Joint Chiefs of Staff

armed forces and Joint Chiefs of Staff both are nouns.

Word	Noun	Adjective	Verb	Adverb
armed forces	Yes	No	No	No
Joint Chiefs of Staff	Yes	No	No	No

armed forces (noun)	Joint Chiefs of Staff (noun)
the military forces of a nation	the executive agency that advises the President on military questions; composed of the chiefs of the United States Army and the United States Navy and the United States Air Force and the commandant of the United States Marine Corps