army engineer vs military

army engineer and military both are nouns.

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

army engineer (noun)	military (noun)
a member of the military who is trained in engineering and construction work	the military forces of a nation

army engineer (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