reader has 6 distinct synonyms spread across 5 of its 8 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.
someone who contracts to receive and pay for a service or a certain number of issues of a publication
Synonyms, antonyms and the broader and narrower relations for reader come from Princeton University’s WordNet. Full sources and licences.
a person who can read; a literate person
someone who reads proof in order to find errors and mark corrections
someone who reads the lessons in a church service; someone ordained in a minor order of the Roman Catholic Church
one of a series of texts for students learning to read