cantor vs choirmaster

cantor and choirmaster both are nouns.

Word	Noun	Adjective	Verb	Adverb
cantor	Yes	No	No	No
choirmaster	Yes	No	No	No

As nouns, cantor and choirmaster are synonyms defined as:

Other synonyms of cantor include precentor.

cantor (noun)	choirmaster (noun)
the official of a synagogue who conducts the liturgical part of the service and sings or chants the prayers intended to be performed as solos	the musical director of a choir
the musical director of a choir