Hyperacid is a term used to describe something that is overly acidic or sour. Synonyms for hyperacid include highly acidic, extremely sour, intensely sour, excessively acidic, and very acidic. These words are often used to describe acidic substances such as lemon juice, vinegar, and other sour foods. Synonyms for hyperacid can also be used in a medical context to describe conditions such as hyperacidity, gastroesophageal reflux disease (GERD), and ulcers, where excessive stomach acid production can cause discomfort and pain. Using synonyms for hyperacid can help to describe acidity in different ways, making writing more interesting and varied.