sight has 21 distinct synonyms spread across 5 of its 9 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.
an instance of visual perception
“the sight of his wife brought him back to reality”
the ability to see; the visual faculty
a range of mental vision
“in his sight she could do no wrong”
take aim by looking through the sights of a gun (or other device)
Synonyms, antonyms and the broader and narrower relations for sight come from Princeton University’s WordNet. Full sources and licences.