theatrical role vs hero

theatrical role and hero both are nouns.

Word	Noun	Adjective	Verb	Adverb
theatrical role	Yes	No	No	No
hero	Yes	No	No	No

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

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

theatrical role (noun)	hero (noun)
an actor's portrayal of someone in a play	the principal character in a play or movie or novel or poem
	a large sandwich made of a long crusty roll split lengthwise and filled with meats and cheese (and tomato and onion and lettuce and condiments); different names are used in different sections of the United States
	a person distinguished by exceptional courage and nobility and strength
	someone who fights for a cause
	(classical mythology) a being of great strength and courage celebrated for bold exploits; often the offspring of a mortal and a god