A cause for alarm is a situation that is potentially dangerous or threatening. FIRE, DANGER, SCARE, BURGLAR, PERIL, and breakin are all words that can be used to describe such a situation. FIRE is a four letter word that describes an uncontrolled blaze that can cause destruction and injury. DANGER is a six letter word that implies a hazardous or risky situation. SCARE is a five letter word that suggests fear or fright. BURGLAR is a seven letter word that refers to someone who illegally enters a building with the intent to commit a crime. PERIL is a five letter word that means a state of great DANGER or risk. Breakin is a seven letter word that is another term for burglary. All of these words can be used to describe a cause for alarm.