burning has 4 distinct synonyms spread across 5 of its 7 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. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
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.
the act of burning something
“the burning of leaves was prohibited by a town ordinance”
a process in which a substance reacts with oxygen to give heat and light
a form of torture in which cigarettes or cigars or other hot implements are used to burn the victim's skin
1 of the 7 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for burning.
Synonyms, antonyms and the broader and narrower relations for burning come from Princeton University’s WordNet. Full sources and licences.