Jacob Epstein vs Sir Jacob Epstein

Jacob Epstein and Sir Jacob Epstein both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jacob Epstein	Yes	No	No	No
Sir Jacob Epstein	Yes	No	No	No

As nouns, Jacob Epstein and Sir Jacob Epstein are synonyms defined as:

Jacob Epstein and Sir Jacob Epstein: British sculptor (born in the United States) noted for busts and large controversial works (1880-1959)

Other synonyms of Jacob Epstein include Epstein.

Jacob Epstein (noun)	Sir Jacob Epstein (noun)
British sculptor (born in the United States) noted for busts and large controversial works (1880-1959)	British sculptor (born in the United States) noted for busts and large controversial works (1880-1959)