second fiddle vs role

second fiddle and role both are nouns.

Word	Noun	Adjective	Verb	Adverb
second fiddle	Yes	No	No	No
role	Yes	No	No	No

As nouns, role is a hypernym of second fiddle; that is, role is a word with a broader meaning than second fiddle:

second fiddle: a secondary role or function
role: the actions and activities assigned to or required or expected of a person or group

Other hypernyms of second fiddle include function, office, part.

second fiddle (noun)	role (noun)
a secondary role or function	the actions and activities assigned to or required or expected of a person or group
someone who serves in a subordinate capacity or plays a secondary role	normal or customary activity of a person in a particular social setting
	what something is used for
	an actor's portrayal of someone in a play