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Our thesaurus is a dictionary of synonyms for many English words. On this page you can find a synonym (or another word) for warning signal. Whether you're a writer, or student, or just a person interested in finding words like warning signal - Thesaurus.net will help you to get exactly what you need.
omen (noun)
augury, caution, foretaste, foretoken, forewarning, harbinger, herald, indication, messenger, omen, portent, pre-indication, premonitory sign, presage, sign, symptom, writing on the wall.
