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automobile horn, car horn, fire alarm, fogsignal, horn, motor horn, siren

., alarming, alarm bell, almost, appal, appall, ball, burglar alarm, clangor, connected, dismay, fire alarm, fire bell, horn, horrify, imperturbable, jump, most, opposite, organiser, organizer, pda, personal digital assistant, personal organiser, personal organizer, security, security consultant, security measures, security system, smoke alarm, sound, start, startle, startled, startling, tocsin, trepidation, unalarming, warning bell

affright, clock, device, fear, fearfulness, fright, frighten, sign, signal, signaling, warn

alarum, warning device, warning signal