military leader vs leader

military leader and leader both are nouns.

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

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

military leader (noun)	leader (noun)
a leader of military forces	a featured article of merchandise sold at a loss in order to draw customers
	a person who rules or guides or inspires others