fictitious character vs Sir John Falstaff

fictitious character and Sir John Falstaff both are nouns.

Word	Noun	Adjective	Verb	Adverb
fictitious character	Yes	No	No	No
Sir John Falstaff	Yes	No	No	No

fictitious character (noun)	Sir John Falstaff (noun)
an imaginary person represented in a work of fiction (play or film or story)	a dissolute character in Shakespeare's plays