accuracy has 1 distinct synonym spread across 1 of its 2 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. Its one recorded opposite is inaccuracy.
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 quality of being near to the true value
“he was beginning to doubt the accuracy of his compass”
(mathematics) the number of significant figures given in a number
“the atomic clock enabled scientists to measure time with much greater accuracy”
Synonyms, antonyms and the broader and narrower relations for accuracy come from Princeton University’s WordNet. Full sources and licences.