director vs drum major

director and drum major both are nouns.

Word	Noun	Adjective	Verb	Adverb
director	Yes	No	No	No
drum major	Yes	No	No	No

As nouns, drum major is a hyponym of director; that is, drum major is a word with a more specific, narrower meaning than director:

Other hyponyms of director include bandleader, bandmaster, drum majorette, majorette.

director (noun)	drum major (noun)
someone who controls resources and expenditures	the leader of a marching band or drum corps
the person who leads a musical group
someone who supervises the actors and directs the action in the production of a show
member of a board of directors
the person who directs the making of a film