Wingback, wingback chair, grandfather chair, ear chair and club chair are one and also the same because these terminologies point out to an item referred to as wing chair. The reason it was called or named as such it’s simply because of the big wing or ear-like mount at the back of this typical simple chair. 

To provide further illustration, these chairs can be most likely to be found in a living room with a fireplace. 

The mounts aren’t just for design, but they offer comfy protection and to enclose heat from the fireplace. The very first wing chairs were not mounted but they bore padded cushions at the stool and in the arm rests as well.