torture has 10 distinct synonyms spread across 7 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 distorting something so it seems to mean something it was not intended to mean
the deliberate, systematic, or wanton infliction of physical or mental suffering by one or more persons in an attempt to force another person to yield information or to make a confession or for any other reason
“it required unnatural torturing to extract a confession”
subject to torture
“The sinners will be tormented in Hell, according to the Bible”
Synonyms, antonyms and the broader and narrower relations for torture come from Princeton University’s WordNet. Full sources and licences.