ban has 13 distinct synonyms spread across 6 of its 9 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.
a decree that prohibits something
100 bani equal 1 leu in Moldova
100 bani equal 1 leu in Romania
an official prohibition or edict against something
prohibit especially by legal means or social pressure
“Smoking is banned in this building”
Synonyms, antonyms and the broader and narrower relations for ban come from Princeton University’s WordNet. Full sources and licences.