army unit vs military

army unit and military both are nouns.

Word	Noun	Adjective	Verb	Adverb
army unit	Yes	No	No	No
military	Yes	Yes	No	No

army unit (noun)	military (noun)
a military unit that is part of an army	the military forces of a nation

army unit (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