Stewart vs Dugald Stewart

Stewart and Dugald Stewart both are nouns.

Word	Noun	Adjective	Verb	Adverb
Stewart	Yes	No	No	No
Dugald Stewart	Yes	No	No	No

As nouns, Stewart and Dugald Stewart are synonyms defined as:

Stewart and Dugald Stewart: Scottish philosopher and follower of Thomas Reid (1753-1828)

Stewart (noun)	Dugald Stewart (noun)
Scottish philosopher and follower of Thomas Reid (1753-1828)	Scottish philosopher and follower of Thomas Reid (1753-1828)
United States film actor who portrayed incorruptible but modest heros (1908-1997)