vision has 6 distinct synonyms spread across 3 of its 5 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 vivid mental image
“he had a vision of his own death”
the ability to see; the visual faculty
the perceptual experience of seeing
“the runners emerged from the trees into his clear vision”
the formation of a mental image of something that is not perceived as real and is not present to the senses
“popular imagination created a world of demons”
a religious or mystical experience of a supernatural appearance
“he had a vision of the Virgin Mary”
Synonyms, antonyms and the broader and narrower relations for vision come from Princeton University’s WordNet. Full sources and licences.