Divan and Day bed

Divan noun - A long upholstered piece of furniture designed for several sitters.

Day bed and divan are semantically related. In some cases you can use "Day bed" instead a noun "Divan".

Day bed noun - Convertible consisting of an upholstered couch that can be converted into a double bed.

Divan and day bed are semantically related. You can use "Divan" instead a noun phrase "Day bed".