Meaning : Fear resulting from the awareness of danger.
Synonyms : consternation, dismay
Meaning : A device that signals the occurrence of some undesirable event.
Synonyms : alarm system, warning device
Meaning : An automatic signal (usually a sound) warning of danger.
Synonyms : alarum, alert, warning signal
Meaning : A clock that wakes a sleeper at some preset time.
Synonyms : alarm clock