fiddler vs twiddler

fiddler and twiddler both are nouns.

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

As nouns, fiddler and twiddler are synonyms defined as:

fiddler and twiddler: someone who manipulates in a nervous or unconscious manner

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