army tank vs military

army tank and military both are nouns.

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

army tank (noun)	military (noun)
an enclosed armored military vehicle; has a cannon and moves on caterpillar treads	the military forces of a nation

army tank (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