fictitious character vs Frankenstein's monster

fictitious character and Frankenstein's monster both are nouns.

Word	Noun	Adjective	Verb	Adverb
fictitious character	Yes	No	No	No
Frankenstein's monster	Yes	No	No	No

fictitious character (noun)	Frankenstein's monster (noun)
an imaginary person represented in a work of fiction (play or film or story)	the monster created by Frankenstein in a gothic novel by Mary Wollstonecraft Shelley (the creator's name is commonly used to refer to his creation)