from 4448; ignition, i.e. (specifically) smelting (figuratively, conflagration, calamity as a test):
KJV-- burning, trial.
from 4442; to kindle, i.e. (passively) to be ignited, glow (literally), be refined (by implication), or (figuratively) to be inflamed (with anger, grief, lust):
KJV-- burn, fiery, be on fire, try.
a primary word; "fire" (literally or figuratively, specifically, lightning):
KJV-- fiery, fire.