ventilation has 7 distinct synonyms spread across 4 of its 4 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.
a mechanical system in a building that provides fresh air
“she was continually adjusting the ventilation”
free and open discussion of (or debate on) some question of public interest
“such a proposal deserves thorough public discussion”
the bodily process of inhalation and exhalation; the process of taking in oxygen from inhaled air and releasing carbon dioxide by exhalation
Synonyms, antonyms and the broader and narrower relations for ventilation come from Princeton University’s WordNet. Full sources and licences.