Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun firebug

2 senses of firebug

Sense 1
arsonist, incendiary, firebug -- (a criminal who illegally sets fire to property)
       => criminal, felon, crook, outlaw, malefactor -- (someone who has committed a crime or has been legally convicted of a crime)

Sense 2
firebug -- (a true bug: brightly colored bug that can exude a stain)
       => heteropterous insect -- (true bugs: insects whose forewings are membranous but have leathery tips)