Synonyms and related words :
Klaxon, Mayday, SOS, active, admonish, advertent, advise, agile, agog, air-raid alarm, alarm, alarm bell, alarm clock, alarm signal, alarum, alert for, alive, all clear, all ears, all eyes, animated, apt, arouse, assiduous, attentive, awake, aware, beacon, blinking light, brainy, breathe, bright, brilliant, burglar alarm, buzz, buzzer, cant, careful, caution, cautious, clear-sighted, clear-witted, clearheaded, clever, concentrated, confide, confide to, conscious, crostarie, cry havoc, cry wolf, decisive, diligent, earnest, entrust with information, equal to, expeditious, fiery cross, finical, finicking, finicky, fire alarm, fire bell, fire flag, five-minute gun, flashing light, fly storm warnings, fog bell, fog signal, foghorn, forewarn, frighten, frisky, full of life, gale warning, gay, give confidential information, give fair warning, give notice, give warning, heedful, hooter, horn, hue and cry, hurricane warning, immediate, instant, instantaneous, intense, intent, intentive, issue an ultimatum, keen, knowing, let in on, let next to, lighthouse, lively, loaded for, lookout, mention privately, mercurial, meticulous, mindful, nice, niggling, nimble, note of alarm, notify, observant, observing, occulting light, on guard, on the, on the alert, on the ball, on the job, on the lookout, open-eared, open-eyed, openmouthed, police whistle, prepared for, prompt, punctual, put hep, put next to, qui vive, quick, quick-witted, ready, ready for, regardful, sharp, signal, signal of distress, siren, sleepless, small-craft warning, smart, sound the alarm, sound the tocsin, speedy, spirited, sprightly, spry, startle, still alarm, storm cone, storm flag, storm warning, summary, swift, threaten, tip, tip off, tocsin, two-minute gun, unblinking, unnodding, unsleeping, unwinking, up, up for, up to, upside-down flag, utter a caveat, vigilant, vivacious, wakeful, warn, warn against, warning, wary, watchful, whisper, whistle, wide awake, wide-awake