hacker: a programmer for whom computing is its own reward; may enjoy the challenge of breaking into other computers but does no harm
programmer: a person who designs and writes and tests computer programs
liver: large and complicated reddish-brown glandular organ located in the upper right portion of the abdominal cavity; secretes bile and functions in metabolism of protein and carbohydrate and fat; synthesizes substances involved in the clotting of the blood; synthesizes vitamin A; detoxifies poisonous substances and breaks down worn-out erythrocytes