admit has 11 distinct synonyms spread across 6 of its 8 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 3 recorded opposites are deny, reject, exclude.
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.
declare to be true or admit the existence or reality or truth of
“He admitted his errors”
serve as a means of entrance
“This ticket will admit one adult to the show”
1 of the 8 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for admit.
Synonyms, antonyms and the broader and narrower relations for admit come from Princeton University’s WordNet. Full sources and licences.