strategy vs military science

strategy and military science both are nouns.

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

As nouns, military science is a hypernym of strategy; that is, military science is a word with a broader meaning than strategy:

strategy: the branch of military science dealing with military command and the planning and conduct of a war
military science: the discipline dealing with the principles of warfare

strategy (noun)	military science (noun)
an elaborate and systematic plan of action	the discipline dealing with the principles of warfare
the branch of military science dealing with military command and the planning and conduct of a war