Acid maltase, also known as acid alpha-glucosidase (GAA), is an enzyme that plays a crucial role in breaking down glycogen into glucose. Synonyms for acid maltase include "acid alpha-glucosidase", "GAA enzyme", and "glycogen debranching enzyme". Acid alpha-glucosidase is abundant in various tissues and cells, particularly in the liver and muscle cells. Its deficiency leads to Pompe disease, a rare inherited disorder characterized by the accumulation of glycogen in lysosomes. Understanding these synonym terms is vital in medical research and diagnosis, as they help scientists and healthcare professionals communicate effectively in the field of enzymology and genetic disorders like Pompe disease.