JFK vs President John F. Kennedy

JFK and President John F. Kennedy both are nouns.

Word	Noun	Adjective	Verb	Adverb
JFK	Yes	No	No	No
President John F. Kennedy	Yes	No	No	No

As nouns, JFK and President John F. Kennedy are synonyms defined as:

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

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

JFK (noun)	President John F. 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)