military vs chief of staff

military and chief of staff both are nouns.

Word	Noun	Adjective	Verb	Adverb
military	Yes	Yes	No	No
chief of staff	Yes	No	No	No

military (noun)	chief of staff (noun)
the military forces of a nation	the senior officer of a service of the armed forces

military (adjective)	chief of staff (adjective)
associated with or performed by members of the armed services as contrasted with civilians
characteristic of or associated with soldiers or the military
of or relating to the study of the principles of warfare