firebug

/ˈfaɪərˌbʌɡ/
noun
  1. A person who deliberately sets fires; an arsonist.
    • The firebug was caught on camera starting a blaze in the abandoned warehouse.
    • Neighbors were shocked to learn that the quiet teenager was a firebug.
    • The police arrested the firebug after he set a series of dumpster fires.
Antonyms
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