mattress

Từ điển WordNet v3.1 - WordNet Dictionary

noun

a large thick pad filled with resilient material and often incorporating coiled springs, used as a bed or part of a bed
• Hypernyms:
pad
• Hyponyms:
air mattress, feather bed, featherbed, futon, paillasse,
palliasse, pallet, spring mattress, tick
• Part Holonyms:
bed