role vs villain

role and villain both are nouns.

Word	Noun	Adjective	Verb	Adverb
role	Yes	No	No	No
villain	Yes	No	No	No

As nouns, villain is a hyponym of role; that is, villain is a word with a more specific, narrower meaning than role:

Other hyponyms of role include bit part, minor role, heavy, hero, ingenue, name part, title role, heroine, baddie.

role (noun)	villain (noun)
the actions and activities assigned to or required or expected of a person or group	a wicked or evil person; someone who does evil deliberately
normal or customary activity of a person in a particular social setting	the principal bad character in a film or work of fiction
what something is used for
an actor's portrayal of someone in a play