The term 'cause havoc' can be broken down into four crossword solutions: WREAK (5 letters), WREAKERS (8 letters), MAYHEM (6 letters), and RAVAGE (6 letters). WREAK means to cause or inflict, usually referring to destruction or damage. Wreakers are those who cause such destruction or damage. MAYHEM is a state of violent disorder or chaos, often caused by the actions of wreakers. RAVAGE refers to the act of causing great destruction or damage, usually through violence. Together, these words describe the act of causing great destruction or chaos, often through violence.