Firefly and Firebug

noun

• Tropical American click beetle having bright luminous spots.
  • synonyms: fire beetle, Pyrophorus noctiluca
• Nocturnal beetle common in warm regions having luminescent abdominal organs.
  • synonyms: lightning bug

(n.) Any luminous winged insect, especially luminous beetles of the family Lampyridae.

noun

• A criminal who illegally sets fire to property.
  • synonyms: arsonist, incendiary
• A true bug: brightly colored bug that can exude a stain. .