Yes, alarm is a Scrabble word!

Verb

1. Fill with apprehension or alarm; cause to be unpleasantly surprised

2. Warn or arouse to a sense of danger or call to a state of preparedness

Noun

1. Fear resulting from the awareness of danger

2. A device that signals the occurrence of some undesirable event

3. An automatic signal (usually a sound) warning of danger

4. A clock that wakes a sleeper at some preset time