army engineer vs engineer

army engineer and engineer both are nouns.

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

As nouns, engineer is a hypernym of army engineer; that is, engineer is a word with a broader meaning than army engineer:

army engineer: a member of the military who is trained in engineering and construction work
engineer: a person who uses scientific knowledge to solve practical problems

Other hypernyms of army engineer include applied scientist, technologist.

army engineer (noun)	engineer (noun)
a member of the military who is trained in engineering and construction work	a person who uses scientific knowledge to solve practical problems
	the operator of a railway locomotive

army engineer (verb)	engineer (verb)
	plan and direct (a complex undertaking)
	design as an engineer