document has 3 distinct synonyms spread across 2 of its 6 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.
writing that provides information (especially information of an official nature)
anything serving as a representation of a person's thinking by means of symbolic marks
a written account of ownership or obligation
(computer science) a computer file that contains text (and possibly formatting instructions) using seven-bit ASCII characters
record in detail
“The parents documented every step of their child's development”
Synonyms, antonyms and the broader and narrower relations for document come from Princeton University’s WordNet. Full sources and licences.