military vs military science

military and military science both are nouns.

Word	Noun	Adjective	Verb	Adverb
military	Yes	Yes	No	No
military science	Yes	No	No	No

military (noun)	military science (noun)
the military forces of a nation	the discipline dealing with the principles of warfare

military (adjective)	military science (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