Stephen Foster vs Foster

Stephen Foster and Foster both are nouns.

Word	Noun	Adjective	Verb	Adverb
Stephen Foster	Yes	No	No	No
Foster	Yes	No	No	No

As nouns, Stephen Foster and Foster are synonyms defined as:

Stephen Foster and Foster: United States songwriter whose songs embody the sentiment of the South before the American Civil War (1826-1864)

Other synonyms of Stephen Foster include Stephen Collins Foster.

Stephen Foster (noun)	Foster (noun)
United States songwriter whose songs embody the sentiment of the South before the American Civil War (1826-1864)	United States songwriter whose songs embody the sentiment of the South before the American Civil War (1826-1864)