Siren is a word used to describe a loud, attention-grabbing sound. There are several synonyms for the word siren, including alarm, alert, whistle, hooter, and blaring. An alarm is a loud noise that warns of danger or an emergency, while an alert is a signal that informs about an impending situation. A whistle is a shrill sound that is produced by blowing air through a small opening, while a hooter is a loud horn-like sound. Blaring is a word used to describe a loud sound that is unpleasant to hear. Synonyms for siren provide writers with a variety of options to choose from depending on the context and tone of their writing.