receiver has 6 distinct synonyms spread across 5 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.
(law) a person (usually appointed by a court of law) who liquidates assets or preserves them for the benefit of affected parties
earphone that converts electrical signals into sounds
the tennis player who receives the serve
a football player who catches (or is supposed to catch) a forward pass
Synonyms, antonyms and the broader and narrower relations for receiver come from Princeton University’s WordNet. Full sources and licences.