burning bush has 12 distinct synonyms spread across 3 of its 4 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.
(Old Testament) the bush that burned without being consumed and from which God spoke to Moses
deciduous shrub having purple capsules enclosing scarlet seeds
Eurasian perennial herb with white flowers that emit flammable vapor in hot weather
densely branched Eurasian plant; foliage turns purple-red in autumn
Synonyms, antonyms and the broader and narrower relations for burning bush come from Princeton University’s WordNet. Full sources and licences.