Mother Goose vs fictitious character

Mother Goose and fictitious character both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mother Goose	Yes	No	No	No
fictitious character	Yes	No	No	No

Mother Goose (noun)	fictitious character (noun)
the imaginary author of a collection of nursery rhymes	an imaginary person represented in a work of fiction (play or film or story)