Acid type is a broad term that encompasses many different types of acids. Nitric acid, with 6 letters, is an inorganic compound used in the production of fertilizers and explosives. Amino acid, with 5 letters, is an organic compound found in proteins and other biological molecules. Boric acid, with 5 letters, is an inorganic compound used as an antiseptic and insecticide. Oleic acid, with 5 letters, is an unsaturated fatty acid found in animal and vegetable fats. URIC acid, with 4 letters, is an organic compound produced by the breakdown of purines in the body. Folic acid, with 5 letters, is an essential vitamin found in leafy green vegetables and other foods.