The term 'Tummy Soother' refers to a type of medication used to relieve indigestion and heartburn. The two crossword solutions for this term are 'BICARB' (6 letters) and 'ANTACID' (7 letters). BICARB is short for bicarbonate, which is an alkaline substance that helps neutralize stomach acid. Antacids are medications that contain ingredients such as aluminum, calcium, magnesium, or sodium bicarbonate that help reduce the amount of acid in the stomach. Both BICARB and antacids are commonly used to treat indigestion and heartburn.