The crossword solution for the term 'PEPPER's Partner' is 'SALT', which is a four letter word. SALT is a mineral composed primarily of sodium chloride, a chemical compound belonging to the larger class of salts; SALT in its natural form as a crystalline mineral is known as rock SALT or halite. It is an essential nutrient for human health and is used as a seasoning in many cuisines around the world. SALT is also used in many industrial processes, and it has been used since ancient times for various purposes.