No one agrees on this one. Any two quilters may give three definitions. Designs sometimes are labeled nice or beautiful or amazing or ugly or demanding or simple-minded or impossible. There are quilters who devote their lives to designing squares, blocks, and quilts. We are not among them, so we should applaud them.
Some wall hangings are six inches square.
Some are the size of a wall. Some are too big to hang on any wall in our house. Wall hangings can be bed quilts if they are spread over a bed, even if they are too small to cover more than a corner of the bed. Quilters are capable of making quilted toaster covers and tea cozies and pot holders and back packs and tote bags and wallets and coin purses and circus tents. If it's quilted, it's a quilt.