permit has 8 distinct synonyms spread across 6 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. Its one recorded opposite is forbid.
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 legal document giving official permission to do something
the act of giving a formal (usually written) authorization
large game fish; found in waters of the West Indies
Synonyms, antonyms and the broader and narrower relations for permit come from Princeton University’s WordNet. Full sources and licences.