character vs title role

character and title role both are nouns.

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

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

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

character (noun)	title role (noun)
(genetics) an attribute (structural or functional) that is determined by a gene or group of genes	the role of the character after whom the play is named
the inherent complex of attributes that determines a persons moral and ethical actions and reactions
a characteristic property that defines the apparent individual nature of something
an actor's portrayal of someone in a play
a written symbol that is used to represent speech
a formal recommendation by a former employer to a potential future employer describing the person's qualifications and dependability
a person of a specified kind (usually with many eccentricities)
an imaginary person represented in a work of fiction (play or film or story)
good repute

character (verb)	title role (verb)
engrave or inscribe characters on