transpire has 1 distinct synonym spread across 1 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.
pass through the tissue or substance or its pores or interstices, as of gas
exude water vapor
“plants transpire”
come to light; become known
“It transpired that she had worked as spy in East Germany”
come about, happen, or occur
“Several important events transpired last week”
Synonyms, antonyms and the broader and narrower relations for transpire come from Princeton University’s WordNet. Full sources and licences.