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WordNet records no synonym and no antonym for mattress. It is the only member of its synset, which is common for technical, taxonomic and single-sense vocabulary — there is no other English word that means the same thing. The broader and narrower terms below are the useful relations in that case.
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 large thick pad filled with resilient material and often incorporating coiled springs, used as a bed or part of a bed
Synonyms, antonyms and the broader and narrower relations for mattress come from Princeton University’s WordNet. Full sources and licences.