WordNet records no synonym and no antonym for stet. It is the only member of each of its synsets, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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.
printing: cancel, as of a correction or deletion
printing: direct that a matter marked for omission or correction is to be retained (used in the imperative)
Synonyms, antonyms and the broader and narrower relations for stet come from Princeton University’s WordNet. Full sources and licences.