Oscar Robertson vs Robertson

Oscar Robertson and Robertson both are nouns.

Word	Noun	Adjective	Verb	Adverb
Oscar Robertson	Yes	No	No	No
Robertson	Yes	No	No	No

As nouns, Oscar Robertson and Robertson are synonyms defined as:

Oscar Robertson and Robertson: United States basketball guard (born in 1938)

Other synonyms of Oscar Robertson include Oscar Palmer Robertson.

Oscar Robertson (noun)	Robertson (noun)
United States basketball guard (born in 1938)	United States basketball guard (born in 1938)