cage has 5 distinct synonyms spread across 4 of its 6 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.
an enclosure made or wire or metal bars in which birds or animals can be kept
something that restricts freedom as a cage restricts movement
Synonyms, antonyms and the broader and narrower relations for cage come from Princeton University’s WordNet. Full sources and licences.
United States composer of avant-garde music (1912-1992)
a movable screen placed behind home base to catch balls during batting practice