television has 12 distinct synonyms spread across 3 of its 3 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.
broadcasting visual images of stationary or moving objects
“she is a star of screen and video”
a telecommunication system that transmits images of objects (stationary or moving) between distant points
an electronic device that receives television signals and displays them on a screen
“the British call a tv set a telly”
Synonyms, antonyms and the broader and narrower relations for television come from Princeton University’s WordNet. Full sources and licences.