conductor vs drum major

conductor and drum major both are nouns.

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

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

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

conductor (noun)	drum major (noun)
a device designed to transmit electricity, heat, etc.	the leader of a marching band or drum corps
the person who leads a musical group
the person who collects fares on a public conveyance
a substance that readily conducts e.g. electricity and heat