fiddler vs violinist

fiddler and violinist both are nouns.

Word	Noun	Adjective	Verb	Adverb
fiddler	Yes	No	No	No
violinist	Yes	No	No	No

As nouns, fiddler and violinist are synonyms defined as:

fiddler (noun)	violinist (noun)
a musician who plays the violin	a musician who plays the violin
an unskilled person who tries to fix or mend
someone who manipulates in a nervous or unconscious manner