out has 14 distinct synonyms spread across 6 of its 17 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 safe.
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.
not allowed to continue to bat or run
“he was tagged out at second on a close play”
knocked unconscious by a heavy blow
to state openly and publicly one's homosexuality
“This actor outed last year”
reveal (something) about somebody's identity or lifestyle
“The gay actor was outed last week”
8 of the 17 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for out.
Synonyms, antonyms and the broader and narrower relations for out come from Princeton University’s WordNet. Full sources and licences.