Chaise Longue (Europe) / Chaise Lounge (USA)
Try divan.
divan
A backless sofa is called a chaise lounge. It typically resembles a sofa, but has no back, and only one arm.
ottoman
stool
A sofa is an English word.
In French, "sofa" is a masculine word. The article "le" is used before sofa.
The plural word for sofa is sofas.
A backless slipper is called a mule.
Backless was created in 1978-11.
The word "sofa" is derived from the Arabic word "ṣuffa," which referred to a raised seating platform with cushions. This term was adopted into various European languages before becoming "sofa" in English.
The word sofa can be traced back to Europe. However, the origin of the word itself is Arabic and means a long upholstered seat.