field marshal vs military

field marshal and military both are nouns.

Word	Noun	Adjective	Verb	Adverb
field marshal	Yes	No	No	No
military	Yes	Yes	No	No

field marshal (noun)	military (noun)
an officer holding the highest rank in the army	the military forces of a nation

field marshal (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