Intimate apparel and Underclothes

Intimate apparel noun - Women's underwear and nightclothes.

Underclothes and intimate apparel are semantically related. In some cases you can use "Underclothes" instead a noun phrase "Intimate apparel".

Underclothes noun - Clothing intended to be worn underneath other clothing.

Intimate apparel and underclothes are semantically related. Sometimes you can replace phrase "Intimate apparel" with "Underclothes", this terms are similar.