fictional character vs Sir Galahad

fictional character and Sir Galahad both are nouns.

Word	Noun	Adjective	Verb	Adverb
fictional character	Yes	No	No	No
Sir Galahad	Yes	No	No	No

fictional character (noun)	Sir Galahad (noun)
an imaginary person represented in a work of fiction (play or film or story)	(Arthurian legend) the most virtuous knight of the Round Table; was able to see the Holy Grail