WordNet (r) 3.0 (2006):

Johnson
    n 1: English writer and lexicographer (1709-1784) [syn:
         Johnson, Samuel Johnson, Dr. Johnson]
    2: 36th President of the United States; was elected vice
       president and succeeded Kennedy when Kennedy was assassinated
       (1908-1973) [syn: Johnson, Lyndon Johnson, Lyndon Baines
       Johnson, LBJ, President Johnson, President Lyndon
       Johnson]
    3: 17th President of the United States; was elected vice
       president and succeeded Lincoln when Lincoln was
       assassinated; was impeached but acquitted by one vote
       (1808-1875) [syn: Johnson, Andrew Johnson, President
       Johnson, President Andrew Johnson]