prohibition has 5 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.
a law forbidding the sale of alcoholic beverages
“in 1920 the 18th amendment to the Constitution established prohibition in the US”
Synonyms, antonyms and the broader and narrower relations for prohibition come from Princeton University’s WordNet. Full sources and licences.
the period from 1920 to 1933 when the sale of alcoholic beverages was prohibited in the United States by a constitutional amendment
refusal to approve or assent to
the action of prohibiting or inhibiting or forbidding (or an instance thereof)
“they were restrained by a prohibition in their charter”