military vs marine engineer

military and marine engineer both are nouns.

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

military (noun)	marine engineer (noun)
the military forces of a nation	a naval officer responsible for the operation and maintenance of the ship's engines

military (adjective)	marine engineer (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