Jack Kennedy vs Kennedy

Jack Kennedy and Kennedy both are nouns.

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

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

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

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

Jack Kennedy (noun)	Kennedy (noun)
35th President of the United States; established the Peace Corps; assassinated in Dallas (1917-1963)	a large airport on Long Island to the east of New York City
	35th President of the United States; established the Peace Corps; assassinated in Dallas (1917-1963)