headquarters vs military

headquarters and military both are nouns.

Word	Noun	Adjective	Verb	Adverb
headquarters	Yes	No	No	No
military	Yes	Yes	No	No

headquarters (noun)	military (noun)
the military installation from which a commander performs the functions of command	the military forces of a nation
(usually plural) the office that serves as the administrative center of an enterprise
(plural) a military unit consisting of a commander and the headquarters staff

headquarters (adjective)	military (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