undercover agent vs military

undercover agent and military both are nouns.

Word	Noun	Adjective	Verb	Adverb
undercover agent	Yes	No	No	No
military	Yes	Yes	No	No

undercover agent (noun)	military (noun)
(military) a secret agent hired by a state to obtain information about its enemies or by a business to obtain industrial secrets from competitors	the military forces of a nation

undercover agent (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