military drill vs exercise

military drill and exercise both are nouns.

Word	Noun	Adjective	Verb	Adverb
military drill	Yes	No	No	No
exercise	Yes	No	Yes	No

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

Other hypernyms of military drill include drill, practice, practice session, recitation.

military drill (noun)	exercise (noun)
training in marching and the use of weapons	the activity of exerting your muscles in various ways to keep fit
	a task performed or problem solved in order to develop skill or understanding
	systematic training by multiple repetitions
	the act of using
	an action, often used negatively and without consequences
	(usually plural) a ceremony that involves processions and speeches

military drill (verb)	exercise (verb)
	do physical exercise
	give a workout to
	learn by repetition
	put to use
	carry out or practice; as of jobs and professions