Noun
lust - A powerful urge or longing – a deep-seated drive that can sometimes lead to irrational or impulsive behavior, often of a sexual nature.

He liked reading the old story about the prince who had a lust for power that drove him to betray even his closest allies.
dunce - A derogatory term used to ridicule someone who is not very clever, or who does not learn easily.
Being called the dunce of the class motivated Joe to work harder and he finished top of the class. Now sometimes he puts on a joker's costume to make fun of those who used to make fun of him.