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fault has 11 distinct synonyms spread across 5 of its 8 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 wrong action attributable to bad judgment or ignorance or inattention
“he made a bad mistake”
(geology) a crack in the earth's crust resulting from the displacement of one side with respect to the other
“they built it right over a geological fault”
(electronics) equipment failure attributable to some defect in a circuit (loose connection or insulation failure or short circuit etc.)
“it took much longer to find the fault than to fix it”
responsibility for a bad situation or event
“it was John's fault”
(sports) a serve that is illegal (e.g., that lands outside the prescribed area)
“he served too many double faults”
Synonyms, antonyms and the broader and narrower relations for fault come from Princeton University’s WordNet. Full sources and licences.