sin has 10 distinct synonyms spread across 5 of its 7 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 act that is regarded by theologians as a transgression of God's will
ratio of the length of the side opposite the given angle to the length of the hypotenuse of a right-angled triangle
(Akkadian) god of the Moon; counterpart of Sumerian Nanna
the 21st letter of the Hebrew alphabet
commit a sin; violate a law of God or a moral law
commit a faux pas or a fault or make a serious mistake
“I blundered during the job interview”
Synonyms, antonyms and the broader and narrower relations for sin come from Princeton University’s WordNet. Full sources and licences.