military vs military operation

military and military operation both are nouns.

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

military (noun)	military operation (noun)
the military forces of a nation	activity by a military or naval force (as a maneuver or campaign)

military (adjective)	military operation (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