jazzman vs musician

jazzman and musician both are nouns.

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

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

Other hypernyms of jazzman include instrumentalist, player.

jazzman (noun)	musician (noun)
a musician who plays or composes jazz music	artist who composes or conducts music as a profession
	someone who plays a music as a profession