military vs undercover agent

military and undercover agent both are nouns.

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

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

military (adjective)	undercover agent (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