From WordNet (r) 3.0 (2006) [wn]:
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]