Shepard vs Sam Shepard

Shepard and Sam Shepard both are nouns.

Word	Noun	Adjective	Verb	Adverb
Shepard	Yes	No	No	No
Sam Shepard	Yes	No	No	No

As nouns, Shepard and Sam Shepard are synonyms defined as:

Shepard and Sam Shepard: United States author of surrealistic allegorical plays (born in 1943)

Shepard (noun)	Sam Shepard (noun)
astronaut who made the first United States' suborbital rocket-powered flight in 1961 (1923-1998)	United States author of surrealistic allegorical plays (born in 1943)
United States author of surrealistic allegorical plays (born in 1943)