harmoniser vs musician

harmoniser and musician both are nouns.

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

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

Other hypernyms of harmoniser include instrumentalist, player.

harmoniser (noun)	musician (noun)
a mediator who brings one thing into harmonious agreement with another	artist who composes or conducts music as a profession
a musician who sings or plays in harmony	someone who plays a music as a profession