WordNet: nightclothes, nightwear, sleepwear

garments designed to be worn in bed

• hypernym article of clothing, clothing, habiliment, vesture, wear, wearable

• hyponym gown, night-robe, nightdress, nightgown, nightie

• hyponym nightshirt

• hyponym jammies, pajama, pj's, pyjama

nightclothes

• (englanti) plural (domain: usage)
• (suomi) yöpukeet (synonyymi)

• (suomi) yöpuku (synonyymi)

nightwear

• (suomi) yöasusteet (synonyymi)

sleepwear

• (suomi) uniasut (synonyymi)