Jimmy Stewart vs James Stewart

Jimmy Stewart and James Stewart both are nouns.

Word	Noun	Adjective	Verb	Adverb
Jimmy Stewart	Yes	No	No	No
James Stewart	Yes	No	No	No

As nouns, Jimmy Stewart and James Stewart are synonyms defined as:

Jimmy Stewart and James Stewart: United States film actor who portrayed incorruptible but modest heros (1908-1997)

Other synonyms of Jimmy Stewart include James Maitland Stewart, Stewart.

Jimmy Stewart (noun)	James Stewart (noun)
United States film actor who portrayed incorruptible but modest heros (1908-1997)	United States film actor who portrayed incorruptible but modest heros (1908-1997)