James Cagney vs Cagney

James Cagney and Cagney both are nouns.

Word	Noun	Adjective	Verb	Adverb
James Cagney	Yes	No	No	No
Cagney	Yes	No	No	No

As nouns, James Cagney and Cagney are synonyms defined as:

James Cagney and Cagney: United States film actor known for his portrayals of tough characters (1899-1986)

Other synonyms of James Cagney include Jimmy Cagney.

James Cagney (noun)	Cagney (noun)
United States film actor known for his portrayals of tough characters (1899-1986)	United States film actor known for his portrayals of tough characters (1899-1986)