Simon vs Neil Simon

Simon and Neil Simon both are nouns.

Word	Noun	Adjective	Verb	Adverb
Simon	Yes	No	No	No
Neil Simon	Yes	No	No	No

As nouns, Simon and Neil Simon are synonyms defined as:

Simon and Neil Simon: United States playwright noted for light comedies (born in 1927)

Other synonyms of Simon include Marvin Neil Simon.

Simon (noun)	Neil Simon (noun)
United States economist and psychologist who pioneered in the development of cognitive science (1916-2001)	United States playwright noted for light comedies (born in 1927)
United States playwright noted for light comedies (born in 1927)
United States singer and songwriter (born in 1942)
one of the twelve Apostles (first century)