7 letters · 13 points in Scrabble
noun a criminal who illegally sets fire to property
noun a true bug: brightly colored bug that can exude a stain
originEtymology tree Proto-Indo-European *péh₂wr̥ Proto-Germanic *fōr Proto-West Germanic *fuir Old English fȳr Middle English fyr English fire English bug English firebug From fire + bug.
Etymology from Wiktionary, CC BY-SA 3.0