Daybed and Futon

Daybed noun - An armless couch; a seat by day and a bed by night.

Futon and daybed are semantically related in sofa topic. In some cases you can use "Futon" instead a noun "Daybed", when it comes to topics like couch, couch that becomes bed.

Futon noun - Mattress consisting of a pad of cotton batting that is used for sleeping on the floor or on a raised frame.

Daybed and futon are semantically related in sofa bed topic. You can use "Daybed" instead a noun "Futon".