director vs bandmaster

director and bandmaster both are nouns.

Word	Noun	Adjective	Verb	Adverb
director	Yes	No	No	No
bandmaster	Yes	No	No	No

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

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

director (noun)	bandmaster (noun)
someone who controls resources and expenditures	the conductor of a band
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