threat

(noun) something that is a source of danger. Synonyms: menace. Example: "Earthquakes are a constant threat in japan."

(noun) a warning that something unpleasant is imminent. Example: "They were under threat of arrest."

(noun) declaration of an intention or a determination to inflict harm on another. Example: "His threat to kill me was quite explicit."

(noun) a person who inspires fear or dread. Synonyms: terror, scourge. Example: "He was the terror of the neighborhood."