The term 'buttonhole, e.g.' can be solved by three crossword solutions: 'SLIT' (4 letters), 'SEW' (3 letters), and 'STITCH' (6 letters). A buttonhole is a SLIT or hole in fabric that is used to attach a button. To create a buttonhole, one must first cut a SLIT in the fabric with a sharp object such as scissors. Then, the edges of the SLIT must be sewn together with a needle and thread. Finally, the edges of the SLIT must be stitched together to secure the buttonhole.