military vs manual of arms

military and manual of arms both are nouns.

Word	Noun	Adjective	Verb	Adverb
military	Yes	Yes	No	No
manual of arms	Yes	No	No	No

military (noun)	manual of arms (noun)
the military forces of a nation	(military) a prescribed drill in handling a rifle

military (adjective)	manual of arms (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