punctuation has 1 distinct synonym spread across 1 of its 3 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.
something that makes repeated and regular interruptions or divisions
the marks used to clarify meaning by indicating separation of words into sentences and clauses and phrases
the use of certain marks to clarify meaning of written material by grouping words grammatically into sentences and clauses and phrases
Synonyms, antonyms and the broader and narrower relations for punctuation come from Princeton University’s WordNet. Full sources and licences.