Sir Galahad vs Galahad

Sir Galahad and Galahad both are nouns.

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

As nouns, Sir Galahad and Galahad are synonyms defined as:

Sir Galahad and Galahad: (Arthurian legend) the most virtuous knight of the Round Table; was able to see the Holy Grail

Sir Galahad (noun)	Galahad (noun)
(Arthurian legend) the most virtuous knight of the Round Table; was able to see the Holy Grail	(Arthurian legend) the most virtuous knight of the Round Table; was able to see the Holy Grail