These are all names for one type of furniture that we all know and most of us have one in our homes. The same piece of furniture can also be called a loveseat, or even a settee. If they have a mattress inside and fold out into a bed, they are usually known as a hideabed. If there is a back, and only one end piece, then they are usually called a chaise lounge. When I was growing up, my mom and dad called it the "daveno" ; but I have since discovered that many people have never heard of this word. Now, it seems like most people just call it a couch, and if it is a very nice one, then it is often referred to as a sofa. One popular brand of couches was made by the Davenport company, and the name began to be used generically for any couch, similar to how "Kleenex" became the word to describe any kind of facial tissue. What names did you grow up hearing that referred to a couch or sofa ? Apparently, daveno was popular in the northwest part of the United States, which would explain why I would have learned it growing up in Idaho. This is our little Sheba Pom (passed away several years ago) enjoying the chaise lounge.