Synset
garments designed to be worn in bed
<noun.artifact>
nightclothes
nightwear
sleepwear
lexical pointers
domain of synset (usage)
plural
semantic pointers
hypernym
clothing, article of clothing, vesture, wear, wearable, habiliment
hyponym
nightdress, nightgown, gown, nightie, night-robe
nightshirt
pajama, pyjama, pj's, jammies