fictitious character vs Tom Sawyer

fictitious character and Tom Sawyer both are nouns.

Word	Noun	Adjective	Verb	Adverb
fictitious character	Yes	No	No	No
Tom Sawyer	Yes	No	No	No

fictitious character (noun)	Tom Sawyer (noun)
an imaginary person represented in a work of fiction (play or film or story)	the boy hero of a novel by Mark Twain