De Niro vs Robert De Niro

De Niro and Robert De Niro both are nouns.

Word	Noun	Adjective	Verb	Adverb
De Niro	Yes	No	No	No
Robert De Niro	Yes	No	No	No

As nouns, De Niro and Robert De Niro are synonyms defined as:

De Niro and Robert De Niro: United States film actor who frequently plays tough characters (born 1943)

De Niro (noun)	Robert De Niro (noun)
United States film actor who frequently plays tough characters (born 1943)	United States film actor who frequently plays tough characters (born 1943)