writing 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.
the act of creating written works
“writing was a form of therapy for him”
Synonyms, antonyms and the broader and narrower relations for writing come from Princeton University’s WordNet. Full sources and licences.
the work of a writer; anything expressed in letters of the alphabet (especially when considered from the point of view of style and effect)
“the writing in her novels is excellent”
(usually plural) the collected work of an author
“the idea occurs with increasing frequency in Hemingway's writings”
letters or symbols that are written or imprinted on a surface to represent the sounds or words of a language
“he turned the paper over so the writing wouldn't show”
the activity of putting something in written form
“she did the thinking while he did the writing”