fire has 39 distinct synonyms spread across 13 of its 21 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is hire.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
bake in a kiln so as to harden
“fire pottery”
drive out or away by or as if by fire
“The soldiers were fired”
generate an electrical impulse
“the neurons fired fast”
the event of something burning (often destructive)
“they lost everything in the fire”
the act of firing weapons or artillery at an enemy
“hold your fire until you can see the whites of their eyes”
once thought to be one of four elements composing the universe (Empedocles)
fuel that is burning and is used as a means for cooking
“put the kettle on the fire”
a severe trial
“he went through fire and damnation”
Synonyms, antonyms and the broader and narrower relations for fire come from Princeton University’s WordNet. Full sources and licences.