sewing has 2 distinct synonyms spread across 2 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. 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.
joining or attaching by stitches
needlework on which you are working with needle and thread
“she put her sewing back in the basket”
Synonyms, antonyms and the broader and narrower relations for sewing come from Princeton University’s WordNet. Full sources and licences.