high command vs leaders

high command and leaders both are nouns.

Word	Noun	Adjective	Verb	Adverb
high command	Yes	No	No	No
leaders	Yes	No	No	No

As nouns, leaders is a hypernym of high command; that is, leaders is a word with a broader meaning than high command:

high command: the highest leaders in an organization (e.g. the commander-in-chief and senior officers of the military)
leaders: the body of people who lead a group

Other hypernyms of high command include leadership.

high command (noun)	leaders (noun)
the highest leaders in an organization (e.g. the commander-in-chief and senior officers of the military)	the body of people who lead a group