cantor vs musician

cantor and musician both are nouns.

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

As nouns, musician is a hypernym of cantor; that is, musician is a word with a broader meaning than cantor:

cantor (noun)	musician (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	artist who composes or conducts music as a profession
the musical director of a choir	someone who plays a music as a profession