John Fitzgerald Kennedy vs Jack Kennedy

John Fitzgerald Kennedy and Jack Kennedy both are nouns.

Word	Noun	Adjective	Verb	Adverb
John Fitzgerald Kennedy	Yes	No	No	No
Jack Kennedy	Yes	No	No	No

As nouns, John Fitzgerald Kennedy and Jack Kennedy are synonyms defined as:

John Fitzgerald Kennedy and Jack Kennedy: 35th President of the United States; established the Peace Corps; assassinated in Dallas (1917-1963)

Other synonyms of John Fitzgerald Kennedy include JFK, Kennedy, President John F. Kennedy, President Kennedy.

John Fitzgerald Kennedy (noun)	Jack Kennedy (noun)
35th President of the United States; established the Peace Corps; assassinated in Dallas (1917-1963)	35th President of the United States; established the Peace Corps; assassinated in Dallas (1917-1963)