Dempsey vs Jack Dempsey

Dempsey and Jack Dempsey both are nouns.

Word	Noun	Adjective	Verb	Adverb
Dempsey	Yes	No	No	No
Jack Dempsey	Yes	No	No	No

As nouns, Dempsey and Jack Dempsey are synonyms defined as:

Dempsey and Jack Dempsey: United States prizefighter who was world heavyweight champion (1895-1983)

Other synonyms of Dempsey include Manassa Mauler, William Harrison Dempsey.

Dempsey (noun)	Jack Dempsey (noun)
United States prizefighter who was world heavyweight champion (1895-1983)	United States prizefighter who was world heavyweight champion (1895-1983)