release has 45 distinct synonyms spread across 20 of its 22 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.
merchandise issued for sale or public showing (especially a record or film)
“a new release from the London Symphony Orchestra”
the act of liberating someone or something
a process that liberates or discharges something
“there was a sudden release of oxygen”
an announcement distributed to members of the press in order to supplement or replace an oral presentation
the termination of someone's employment (leaving them free to depart)
a legal document evidencing the discharge of a debt or obligation
a formal written statement of relinquishment
(music) the act or manner of terminating a musical phrase or tone
Synonyms, antonyms and the broader and narrower relations for release come from Princeton University’s WordNet. Full sources and licences.
make (information) available for publication
“release the list with the names of the prisoners”
part with a possession or right
“I am relinquishing my bedroom to the long-term house guest”