persona vs title role

persona and title role both are nouns.

Word	Noun	Adjective	Verb	Adverb
persona	Yes	No	No	No
title role	Yes	No	No	No

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

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

persona (noun)	title role (noun)
(Jungian psychology) a personal facade that one presents to the world	the role of the character after whom the play is named
an actor's portrayal of someone in a play