role vs minor role

role and minor role both are nouns.

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

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

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

role (noun)	minor role (noun)
the actions and activities assigned to or required or expected of a person or group	a small 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