Words with fiery word roots (from the books)
ablaze
ardently (HP)
arson
backfire (HP)
conflagration
effulgent
fervently
fire
flagrant (HP)
flamboyant (HP)
flamboyantly (HP)
flamed
flames (HP)
fulgent
ignited (HP)
incensed (HP)
infernal
inferno
tinder (TI)
One word root meaning fire has come to mean strong feeling, and another has come to mean showy, bold, or conspicuous. One of our fire words came from a root meaning down below; a religious metaphor, perhaps?
Making Ripples 