distortion has 8 distinct synonyms spread across 4 of its 6 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.
a shape resulting from distortion
an optical phenomenon resulting from the failure of a lens or mirror to produce a good image
a change (usually undesired) in the waveform of an acoustic or analog electrical signal; the difference between two measurements of a signal (as between the input and output signal)
“heavy metal guitar players use vacuum tube amplifiers to produce extreme distortion”
the act of distorting something so it seems to mean something it was not intended to mean
the mistake of misrepresenting the facts
Synonyms, antonyms and the broader and narrower relations for distortion come from Princeton University’s WordNet. Full sources and licences.