Joint Chiefs of Staff vs armed forces

Joint Chiefs of Staff and armed forces both are nouns.

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

Joint Chiefs of Staff (noun)	armed forces (noun)
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	the military forces of a nation