night-robe vs intimate apparel

night-robe and intimate apparel both are nouns.

Word	Noun	Adjective	Verb	Adverb
night-robe	Yes	No	No	No
intimate apparel	Yes	No	No	No

As nouns, intimate apparel is a hypernym of night-robe; that is, intimate apparel is a word with a broader meaning than night-robe:

night-robe: lingerie consisting of a loose dress designed to be worn in bed by women
intimate apparel: women's underwear and nightclothes

Other hypernyms of night-robe include lingerie, nightclothes, nightwear, sleepwear.

night-robe (noun)	intimate apparel (noun)
lingerie consisting of a loose dress designed to be worn in bed by women	women's underwear and nightclothes