Sir Rex Harrison vs Rex Harrison

Sir Rex Harrison and Rex Harrison both are nouns.

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

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

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

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

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