Rex Harrison vs Sir Rex Harrison

Rex Harrison and Sir Rex Harrison both are nouns.

Word	Noun	Adjective	Verb	Adverb
Rex Harrison	Yes	No	No	No
Sir Rex Harrison	Yes	No	No	No

As nouns, Rex Harrison and Sir Rex Harrison are synonyms defined as:

Rex Harrison and Sir Rex Harrison: English actor on stage and in films (1908-1990)

Other synonyms of Rex Harrison include Harrison, Reginald Carey Harrison.

Rex Harrison (noun)	Sir Rex Harrison (noun)
English actor on stage and in films (1908-1990)	English actor on stage and in films (1908-1990)