flute player vs musician

flute player and musician both are nouns.

Word	Noun	Adjective	Verb	Adverb
flute player	Yes	No	No	No
musician	Yes	No	No	No

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

Other hypernyms of flute player include instrumentalist, player.

flute player (noun)	musician (noun)
someone who plays the flute	artist who composes or conducts music as a profession
	someone who plays a music as a profession