supreme headquarters vs leaders

supreme headquarters and leaders both are nouns.

Word	Noun	Adjective	Verb	Adverb
supreme headquarters	Yes	No	No	No
leaders	Yes	No	No	No

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

supreme headquarters: 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 supreme headquarters include leadership.

supreme headquarters (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