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os has 5 distinct synonyms spread across 4 of its 5 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.
a hard brittle blue-grey or blue-black metallic element that is one of the platinum metals; the heaviest metal known
(computer science) software that controls the execution of computer programs and may provide various services
rigid connective tissue that makes up the skeleton of vertebrates
Synonyms, antonyms and the broader and narrower relations for os come from Princeton University’s WordNet. Full sources and licences.