word processing system has 1 distinct synonym spread across 1 of its 1 sense. 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 application that provides the user with tools needed to write and edit and format text and to send it to a printer
Synonyms, antonyms and the broader and narrower relations for word processing system come from Princeton University’s WordNet. Full sources and licences.