The term 'having a gap' can be described by the word 'hiatal, ' which is a six-letter word. A hiatal is a type of hernia, which is a condition in which an organ or tissue protrudes through the wall of the cavity that normally contains it. Hiatal hernias occur when the upper part of the stomach pushes up through the diaphragm, which is the muscle that separates the chest from the abdomen. This can cause symptoms such as heartburn, chest pain, and difficulty swallowing. Treatment for hiatal hernias typically involves lifestyle changes, medications, and surgery.